Question

I won't go out for a walk ________ he comes early this afternoon．

1. A.
   that
2. B.
   whether
3. C.
   what
4. D.
   if

Answer 1

D
考查连词的含义及用法．that, whether(是否)，what(什么)引导宾语从句，if既可引导宾语从句，也可引导条件状语从句．根据句子意思应选D, if表示如果……就．