摘要：4．He will give us a report on how to study English well.but when and where . A．is still unknown B．hasn’t decided C．is known D．haven’t been decided 解析:选A.本题考查who.which.what.when.where等引导的从句作主语或单独引导疑问句时谓语动词用单数.排除D.C项不符合句意.B项应用被动形式.所以选A.

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