问题
选择题
We’ll have a picnic in the Summer Palace this Sunday ________it rains or it’s very cold.
A．since
B．if
C．until
D．unless
答案
答案：D
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We’ll have a picnic in the Summer Palace this Sunday ________it rains or it’s very cold.
A．since
B．if
C．until
D．unless
答案：D