来自邵栋梁的问题
Ifhe____hard，hewouldhavepassedtheexam．（）A.weretoworkB.hadworkedC.shouldworkD.wastowork
If he ____hard，he would have passed the exam．（）
A.were to work
B.had worked
C.should work
D.was to work
答案B．由“hewouldhavepassedtheexam”可知与过去的虚拟，故句型结构为，if+主语+haddone，主语+would/could/might/should+havedone．故选B．
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