问题
选择题
—Shall we have our picnic tomorro
w?
—________ it doesn't rain.[ ]
A. Until
B. While
C. Once
D. If
答案
答案：D
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—Shall we have our picnic tomorrow?
—________ it doesn't rain.[ ]
A. Until
B. While
C. Once
D. If
答案：D