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

题目简介

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

题目详情

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
题型:单选题难度:中档来源:江苏期中题

答案

D

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