2. 外语
  3. The (principal) reason for the great (number of) smoke is (that) there are (too many) factories in this area.

The (principal) reason for the great (number of) smoke is (that) there are (too many) factories in this area.

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问题 The (principal) reason for the great (number of) smoke is (that) there are (too many) factories in this area.
选项 A、principal
B、number of
C、that
D、too many
答案B
解析
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成人本科学位英语

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