Health Trails magazine featured an article last month on how and why staying ins

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问题 Health Trails magazine featured an article last month on how and why staying inside an air-conditioned room for long periods can______illness.

选项 A、produce
B、producing
C、to produce
D、has produced

答案 A

解析助动词can之后应使用动词原形，因此选(A)produce(引起)。(B)现在分词或动名词，(C)不定式结构和(D)第三人称单数形式都不能接在助动词后面。

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