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

B 考查虛擬語氣。題意“我數(shù)學(xué)考試不及格真是太糟糕了，要是我之前努力學(xué)習(xí)就好了”。if only后面的從句中要用虛擬語氣，從語境可知此處是對過去情況的一種虛擬，所以謂語動詞要用過去完成時。故選B。

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