He had to retire early poor health.A．as a resultB．becauseC．soD．because of 题目和参考答案——青夏教育精英家教网——

题目内容

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

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

D

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。

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