问题

He is very grateful to the girl____ he often turns for help when he meets with difficulties.
A:whom
B:to whom
C:to who
D:which
B:to whom
C:to who
D:which
正确答案是:
同类题型
He will take you as well—But I’d rather he ______
.Wait till you are more ______. It’s better to be sure than sorry.
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Let’s climb the mountain.—I don’t agree. _______ the mountain will make us exhausted.