I personally think__more listening, speaking, reading and writing is the key to_
题型：不详难度：来源：
I personally think__more listening, speaking, reading and writing is the key to__our English.| A．Doing; improve | B．To do; improve | C．Do; improving | D．Doing; improving |
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答案
| D |
解析
| think后是宾语 从句，且缺少主语，the key to中 to是介词，后面要跟doing形式，而C项Do不能作主语，所以选D。 |
举一反三
—I’ m sorry, but I didn’t mean__________ out your secret.
—But you know, letting out one’s secret means________ one’ s feelings.| A．to let; to hurt | B．letting; hurting | | C．to let; hurting | D．letting; to hurt |
|
He has devoted himself __ mankind.
to benefit B. benefiting C. to benefiting D. benefited |
The professor explained this theory so clearly that this phenomenon was easy enough ________.| A．for us to work out | B．working out | | C．for working out | D．to working out |
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The letter he had been looking forward to ____ at last .| A．arrive | B．arrives | C．arriving | D．arrived |
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When the young man found himself ____ in the land with so many beautiful flowers ,he felt delighted .| A．lie | B．lain | C． lying | D．lay |
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