How can you expect him to make any improvement you never give him a chance to have a try?A

问题补充：

How can you expect him to make any improvement you never give him a chance to have a try?

A. unless

B. when

C. until

D. even if

答案：

A. unless

(答案→)B. when

C. until

D. even if

解析：考查连词。此处when意为既然。句意为既然你不给他尝试的机会，你怎么能期望他提高呢。