问题
选择题
He had to retire(退休) early ______ poor health.
A．as a result
B．because
C．so
D．because of
答案
答案：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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He had to retire(退休) early ______ poor health.
A．as a result
B．because
C．so
D．because of
答案：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。