2. 外语
  3. The project requires more labor______has been put in because it is extremely difficult.

The project requires more labor______has been put in because it is extremely difficult.

admin2014-07-20  17
问题 The project requires more labor______has been put in because it is extremely difficult.
选项 A、what
B、which
C、than
D、as
答案C
解析
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