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)動詞。if引導(dǎo)的條件狀語從句與過去是相反，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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