The difficulty is ________ we haven't so many workers.


  1. A.
    which
  2. B.
    that
  3. C.
    what
  4. D.
    why
B
解析：本題考查表語從句的引導(dǎo)詞。從所給的選項看，四個詞都可以引導(dǎo)表語從句，但表語從句為陳述句語序，只能用that引導(dǎo)。故本題正確答案為B。which，what，why都用于引導(dǎo)表示疑問的從句。題意為：困難在于我們沒有這么多工人。
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