He couldn’t take part in the final exam _______ his serious illness.
A．becauseB．lead toC．because ofD．when
C

試題分析：考查短語用法。AD項后面要接句子。BC項后面要接名詞或者名詞短語。Lead to導(dǎo)致，通向；Because of因為，由于；句意：由于嚴重的疾病，他不能參加最后的考試。故C正確。
點評：because與when后面要接句子。Lead to和because of后面要接短語或者名詞。
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