问题
选择题
We'll have a picnic in the park this Sunday ________ it rains or it's very cold.[ ]
A．since
B．if
C．unless
D．until
答案
答案：C
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We'll have a picnic in the park this Sunday ________ it rains or it's very cold.[ ]
A．since
B．if
C．unless
D．until
答案：C