Mr Xu is very patient. He always spends much time the difficult problems us againand again. [ ]A. explain; to B. explaining; to C. to explain; for D. explaining; for 题目和参考答案——青夏教育精英家教网——

题目内容

Mr Xu is very patient. He always spends much time _____ the difficult problems _____ us again
and again.

[ ]

A. explain; to
B. explaining; to
C. to explain; for
D. explaining; for

D

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