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;-初中英语-n多题

◎ 题干

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

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◎ 解析

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◎ 知识点

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