Youcanhardlyimaginethattheduckshere

问题详情：

 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考查时态和语态。ducks和feed关系为被动。

知识点：一般现在时及其被动式

题型：选择题