You should visit your parents _____, even when you are very busy.
A．by and byB．more or lessC．step by stepD．now and then
D               
             
試題分析：考查固定短語。A 不久以后B 或多或少C 逐漸的D時(shí)不時(shí)。句意 你應(yīng)時(shí)不時(shí)去看看你的父母，尤其當(dāng)你很忙的時(shí)候。根據(jù)句意選D項(xiàng)          
考點(diǎn) : 考查固定短語
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