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 【解析】句意:由于健康状况不佳,他不得不提前退休。A. as a result“结果”;B. because “因为”,引导句子;C. so “因此”,引导句子;D. because of“由于”,后接名词或动名词。poor health“健康状况不佳”是短语,故选D。
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