Question

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

Answer 1

C

试题分析：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。