A-A+
In the experiment we kept a watchful eye _____
问题详情
In the experiment we kept a watchful eye ______ the developments and recorded every detail.
A.in
B.at
C.for
D.on请帮忙给出正确答案和分析,谢谢!
参考答案
正确答案:D
解析:考查固定搭配。keep an eye on意为“密切注意”,是一个固定搭配,因此选项D为正确答案。