---It’sdifficultforthevillagechildrentocrosstheriverfo...

問題詳情：

 --- It’s difficult for the village children to cross the river for school.

   --- I think a bridge ________ over the river.

       A. should be built     B. is being built    C. has been built     D. was built

【回答】

A

知識點：動詞語態

題型：選擇題