问题 
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I catch a cold now and then.A.alwaysB.occasionallyC.constantlyD.regularly
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I catch cold 【now and then】.A. alwaysB. occasiona
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I catch a cold 【now and then】 .A. alwaysB.occasio
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I catch cold 【now and then】.A. alwaysB. occasiona
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I catch a cold 【now and then】.A. alwaysB. occasio
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I catch cold【 now and then】.A.always B.occasional
 
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