Scientiststhousandsofchemicals

Scientists ______ thousands of chemicals before they decided on the right one in the end.

A．tried out	B．found out
C．worked out	D．turned out

登录免费查看答案和解析

相关试题

He was reported _______in that country when he was having holiday there last year.

A．being badly treated	B．treating badly
C．to be treated badly	D．to have been treated badly

收藏答案/解析

The old man said the accident _______ careless driving, so a lot of money________ be paid by the driver.

A．was due to; was due to	B．due to; was due to
C．is due to; was due to	D．is due to; was due to

收藏答案/解析

Many policemen and soldiers are _______ the forest _______ the prisoner escaping from prison.

A．searching for; searching

B．searching; searching

C．searching; in search of

D．in search for; searching for

收藏答案/解析

Mr. Wang, who _____ in this city ever since thirty years ago, _____ a report for the last two years.

A．has lived; had prepared

B．has been living; has been preparing

C．lived; has been preparing

D．has been living; has prepared

收藏答案/解析

I won't tell the student the answer to the math problem until he on it for more than an hour.

A．has been working	B．will have worked
C．will have been working	D．had worked

收藏答案/解析

推荐套卷

热门套卷