If they had known what was coming next, they __ their mind.
A.may changeB.could changeC.must have changedD.might have changed
D
考查情態(tài)動(dòng)詞。if引導(dǎo)的條件狀語(yǔ)從句與過去是相反,主句中要用would/should might have done. 而must have done表示一定已經(jīng)做了某事。
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