语法与词汇
9.
The project requires more labor than ______ because it is extremely difficult.
A、
has been put in
B、
have been put in
C、
being put in
D、
to be put in
【正确答案】
A
【答案解析】
根据句意，应用现在完成时态，排除C、D项；labor不可数名词，谓语用单数，排除B项。
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