【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(xué)題對(duì)我們來(lái)說(shuō)確實(shí)難以解答出來(lái)。通常，由“動(dòng)詞+介詞”構(gòu)成的短語(yǔ)接賓語(yǔ)時(shí)，如果賓語(yǔ)是代詞，代詞應(yīng)置于動(dòng)詞與介詞中間。根據(jù)語(yǔ)境，這里由“動(dòng)詞+介詞”構(gòu)成的短語(yǔ)不需再接賓語(yǔ)，否則就與前面的“the math problem”重復(fù)了。此外，這里應(yīng)用動(dòng)詞不定式作后置定語(yǔ)。故應(yīng)選B。

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