【題目】The math problem is really difficult for us_________.

A. to work it out B. to work out

C. to work out it D. working it out

【答案】B

【解析】

試題分析：句意為：這道數(shù)學題對我們來說確實難以解答出來。通常，由“動詞+介詞”構成的短語接賓語時，如果賓語是代詞，代詞應置于動詞與介詞中間。根據(jù)語境，這里由“動詞+介詞”構成的短語不需再接賓語，否則就與前面的“the math problem”重復了。此外，這里應用動詞不定式作后置定語。故應選B。

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