He had to retire(退休) early ______ poor health.A．as a resultB．becauseC．soD．becaus

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He had to retire(退休) early ______ poor health.

A．as a result	B．because
C．so	D．because of

答案

解析

连词考查。Because与because of都表示原因，但because必须引导句子，而because of后跟名词。

举一反三

We should protect the earth， we will have no water to drink．

A．so

B．or

C．and

D．but

题型：不详难度：| 查看答案

Come on, ______you"ll be late.
A. and B. but C. or d. so

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—Would you like to go for a walk with me, Allen?
—I"d love to, ________you don"t want to go alone.

A．until

B．before

C．if

D．after

题型：不详难度：| 查看答案

Stephen Hawking can’t walk or even speak，_____he has become very succ

essful.

A．but

B．and

C．or

D．then

题型：不详难度：| 查看答案

We can easily become unhappy_____ we work out our problems in our daily life.

A．after

B．if

C．until

D．unless

题型：不详难度：| 查看答案