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  3. In 1974 a large area of the surface of Mercury was photographed from varying distances, which revealed a degree of cratering sim

In 1974 a large area of the surface of Mercury was photographed from varying distances, which revealed a degree of cratering sim

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问题 In 1974 a large area of the surface of Mercury was photographed from varying distances, which revealed a degree of cratering similar to that of the Moon’s.
选项 A、which revealed a degree of cratering similar to that of the Moon’s
B、to reveal a degree of cratering similar to the Moon
C、revealing a degree of cratering similar to that of the Moon
D、and revealed cratering similar in degree to the Moon
E、that revealed cratering similar in degree to that of the Moon
答案C
解析 Logical predication; Parallelism
This sentence’s second clause, expressing what the imaging of Mercury showed, must be linked to the first clause in a grammatically correct way.
This is best done either by an appositive relative clause (requiring the relative marker which), or by a clause starting with a nonfinite verb (to reveal or revealing). Also, whatever is said to be similar to a degree of cratering (on Mercury) should also be a degree of cratering (on the Moon); this must be expressed clearly.
A The use of which is correct, but that of the Moons is inferior to that of the Moon, because the possessive’ and that of the redundantly express the same idea. That of the Moon’s appears to refer, illogically, to cratering of some unspecified thing that belongs to the Moon, not cratering of the Moon itself.
B To reveal is acceptable, but to the Moon incorrectly compares a physical entity (the Moon) to a degree of cratering.
C Correct. Revealing is a good way to start the second clause, and to that of the Moon properly contrasts two degrees of cratering.
D And is incorrect as a way to introduce the second clause; to the Moon makes the wrong sort of comparison.
E That is not the correct way to introduce an appositive relative clause. That is typically used restrictively, whereas the comma preceding it makes the ensuing clause nonrestrictive. This leaves the meaning unclear.
The correct answer is C.
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