—IfindlearningEnglishfrustrating.—Youwillneverimproveyo...

問題詳情：

— I find learning English frustrating.

— You will never improve your English _______ you work harder at it.

A.  if      B. unless        C. even though        D. when

【回答】

B

知識點：連詞

題型：選擇題