问题
选择题
— Shall we pay a visit to the Great Wall tomorrow morning?
— ____ it rains. [ ]
A. If
B. Until
C. since
D. Unless
答案
答案：D
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— Shall we pay a visit to the Great Wall tomorrow morning?
— ____ it rains. [ ]
A. If
B. Until
C. since
D. Unless
答案：D