问题
选择题
They had to wait _____ the dog _____ out of the room. [ ]
A. for; come
B. for; to come
C. at; to come
D. at; coming
答案
答案：B
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They had to wait _____ the dog _____ out of the room. [ ]
A. for; come
B. for; to come
C. at; to come
D. at; coming
答案：B