To make our hometown more beautiful, you ________ throw rubbish into the river.

A. needn't

B. mustn't

C. must

D. may

練習冊系列答案
相關習題

科目:初中英語 來源: 題型:013

桯ow hard this job is!

  梇ou should make more persons __________ you.

  A.help  B.to help  C.helping  D.be helped

查看答案和解析>>

同步練習冊答案