If Aan astronomer looks at Bstar that is Cone hundred light years away, Dthe light that can be seen is one hundred years old.

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问题 If Aan astronomer looks at Bstar that is Cone hundred light years away, Dthe light that can be seen is one hundred years old.

选项 A、
B、
C、
D、

答案B

解析 Star is an indefinite singular countable noun that needs an article. Correction: a star.

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