Question

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

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

Answer 1

【答案】C

【解析】句意：他们又累又饿，因此他们很难坚持工作。have problems doing sth.做某事有困难；keep doing sth.坚持做某事。结合句意可知，答案为C。