问题
选择题
we’ll go to the Great Wall___ there is heavy rain tomorrow.
OK! Walking on the Great Wall must be great fun.
A．as soon as
B．when
C．unless
D．if
答案
答案：C
题目分析：句意：如果明天不下大雨我们将要参观长城。A一……就B当C如果不D如果，根据句意，感谢信C。
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