Question

To make our city more beautiful, rubbish ________ into the river.

[　　]

A. needn't be thrown

B. mustn't be thrown

C. can't throw

D. may not throw

Answer 1

答案：B
提示：

這是含有情態(tài)動(dòng)詞的被動(dòng)語態(tài).首先應(yīng)排除C和D，因?yàn)樗鼈兪侵鲃?dòng)語誠；含有情態(tài)動(dòng)詞的被動(dòng)語態(tài)的構(gòu)成應(yīng)該是：“情態(tài)動(dòng)詞＋be＋及物動(dòng)詞的過去分詞”，needn't是“不必”= don't have to ; mustn't是“禁止，不準(zhǔn)”之意，故選B.