问题
选择题
— Shall we have a picnic this Sunday?
— Unless it________.[ ]
A. rains
B. will rain
C. has rained
D. rained
答案
答案：A
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— Shall we have a picnic this Sunday?
— Unless it________.[ ]
A. rains
B. will rain
C. has rained
D. rained
答案：A