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 |
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 |
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