问题

__________ I was talking on the phone, my mother arrived at home.

A:of ,learning
B:for, learning
C:of, to learn
D:for, to learn;

正确答案是：

同类题型

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ingonline cchoice, but not _____ websites aresafeenoung for shopping.

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Excuse me， Ann. Is this your pen—-Yes， it’s _____. Thank you.