He met many problems ______ he was going over his lessons.A．beforeB．as soon asC．

题型：不详难度：来源：

He met many problems ______ he was going over his lessons.

A．before

B．as soon as

C．since

D．while

答案

解析

翻译：当他正在复习他的功课时他遇见了很多困难
A在。。。。之前
B一。。。。就
C自从
D当。。。。时
故选D

举一反三

She doesn’t send emails_______ watch movies on computer.

A．and

B．or

C．so

D．but

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---Sorry, I can’t. ____________ I can sing well.
A then B And C But D Because

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My sister started ice skating ____she was four.
A. because B. when C. so

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A. because B. as C. although

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A．Because

B．Thanks to

C．Thanks for

D．With the help of

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