问题
She had never been to the Great Wall before.Today she saw it the first time.[ ]
A: at
B: for
C: in
D:by
B: for
C: in
D:by
正确答案是：
同类题型
MrGreenwon’tleavehereuntilhiswife ______backtomorrow.[ ]
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You’d better wear a pair of comfortable trainers when ________a long walk.
Your father looks tired! — Yes, he worked for _________ after twelve o’clock.