_________that river ________very clean?
A．Did ;use to B．Did ;use to be C．Does ;used to D．Does ;use to be
B

試題分析：句意：那條河過(guò)去干凈嗎？used to的一般疑問(wèn)句應(yīng)借助助動(dòng)詞did,即Did ---use to do---? 由于clean是形容詞，要與系動(dòng)詞be連用,故應(yīng)選B。
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