问题补充:
It’s too bad that I failed in the math exam. If only I hard at it!
A. worked
B. had worked
C. has worked
D. would work
答案:
A. worked
(答案→)B. had worked
C. has worked
D. would work
解析:考查虚拟语气:if only表示“但愿…就好了”,后面的从句用虚拟语气,谓语用相应的过去时,和现在相反用过去时,和过去相反用过去完成时,和将来相反用过去将来时。这句话是指和过去相反,用过去完成时。句意是:我数学考试没及格,真是太糟糕了。选B