I think students shouldn't ________ to do too much homework. We'd better ________ them enough time to do sports and have other experiences.A.be allowed；leaveB.allow ；leaveC.be allowed；to leaveD.allow；leaving
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A解析had better后接动词原形，故C，D先排除；根据句意，前一句中应选择被动语态，故只能选择A。