Question

_________that river ________very clean?

A．Did ;use to

B．Did ;use to be

C．Does ;used to

D．Does ;use to be

Answer 1

B

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