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情态动词的否定用法  ( D )1.—Can we walk across the road now? —No，we ________.We have to wait until the light turns green. A．couldn't B．needn't C．shouldn't D．mustn't ( B )2.Students ________ be allowed to get their ears pierced. A．needn't B．shouldn't C．can D．may ( A )3.—Must I return the books today? —No，you________.You can keep them for three days. A．needn't B．can't C．mustn't D．shouldn't (责任编辑：admin) |