问题
选择题
I left my umbrella in my room.Could you wait _____ I go back to get it?[ ]
A.when
B.if
C.while
D.before
答案
答案：C
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I left my umbrella in my room.Could you wait _____ I go back to get it?[ ]
A.when
B.if
C.while
D.before
答案：C