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