It worries the couple a lot ______ their only son is behaving worse and worse these days.
A．howB．whyC．thatD．what
C

試題分析：考查主語從句，這里it是形式主語，that是引導(dǎo)主語從句，主語從句中不缺成分，用that引導(dǎo)，句意：他們唯一的兒子最近表現(xiàn)越來越差讓這對夫婦很擔(dān)心。選C。
點評：引導(dǎo)主語從句的that在從句中不做成分，只起到連接的作用，學(xué)生要會分析句子成分。
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