---Whoisrunningonthesportsfield?  ---It       beDavid,H...

問題詳情：

---Who is running on the sports field?

   ---It        be David, He is ill at home.

   A. can't      B. mustn't          C. may not        D. shouldn't

【回答】

A

知識點：情態動詞

題型：選擇題