Had they known what was coming next, they　　　second thoughts.
A．may haveB．could have
C．must have hadD．might have had
D

試題分析：句意：如果他們知道接下來是什么,他們可能會重新考慮的。Had they known what was coming next=If  they had known what was coming next，表示如果過去他們知道將會發(fā)生什么事，后半句應(yīng)用 could/should /might/would+have+p.p.的形式，表示對過去事實(shí)的假設(shè)。故選D。
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