【題目】Most American children go to state schools, but the private schools __________ be very good.

A. must B. can

C. should D. ought to

【答案】B

【解析】句意：大多數(shù)美國兒童上公立學(xué)校,但私立學(xué)校可能很好。must必須;肯定;can表示客觀可能性;should和ought to同義,意為“應(yīng)該”

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