In the experiment we kept a watchful eye ________ the developments and recorded

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In the experiment we kept a watchful eye ________ the developments and recorded every detail.

A．in

B．at

C．for

D．on

答案

解析

因为keep an eye on…是习语，意为“密切注视…”。

举一反三

I’ve kept up a friendship with a girl whom I was at school ________ twenty years ago.

A．till

B．with

C．about

D．since

题型：不详难度：| 查看答案

The woman sold the eggs ________ seven dollars and they were sold ________ half price.

A．with, at

B．for, at

C．at, in

D．by, on

题型：不详难度：| 查看答案

If his parents are convinced ______ the fact that his son always focuses his mind _______his study.

A．of; on

B．of; at

C．by; to

D．on; at

题型：不详难度：| 查看答案

_____ writer, she is excellent, _____ teacher she is not very good.

A．As; but as

B．As; and as

C．As a ; but as a

D．As a; and as a

题型：不详难度：| 查看答案

____ the rain, he insisted, the football game can not be cancelled.

A．Instead of

B．In spite of

C．Due to

D．In relation to

题型：不详难度：| 查看答案