Question

【题目】He had to retire(退休)early _____ poor health.
A.as a result
B.because
C.so
D.because of

Answer 1

【答案】D
【解析】句意：由于健康差他不得不早点退休。A, as a result结果；B. because 因为；C. So因此；D. because of由于……的原因。结合语境，故选D。