Youcanhardlyimaginethattheduckshere

問題詳情：

 You can hardly imagine that the ducks here ______ on milk.

A. are feeding       B. are fed           C. were fed             D. have fed

【回答】

B考查時態和語態。ducks和feed關係爲被動。

知識點：一般現在時及其被動式

題型：選擇題