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

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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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