--Our English teacher tells us that ______ grammar is a good way to learn English.--And our teacher says _____ also helpful to sing English songs.A.study, that wasB.is studying, it’sC.studying, it’sD.studied, that was
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C解析本题第一空考查的是动词的非谓语形式，作为主语时相当于三单形式，say+that从句，故选