【題目】They were tired and hungry, so they had problems ________.

A. to keep work B. to keep working C. keeping working D. keeping to work

【答案】C

【解析】句意：他們又累又餓，因此他們很難堅持工作。have problems doing sth.做某事有困難；keep doing sth.堅持做某事。結(jié)合句意可知，答案為C。

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