Maybe if I_____ science, and not literature then, I would be able to give you more  help. 
A．studiedB．wouldstudyC．hadstudiedD．wasstudying
C

試題分析：句意為：如果我那時學(xué)的是科學(xué)，而不是文學(xué)，那么我也許能幫助你。虛擬語氣的用法是從句的謂語動詞要在主句的謂語動詞的基礎(chǔ)上往后退一個時態(tài)。即如果句子主句是一般式，那么從句就要用過去式。但在這個句子中，主句是對現(xiàn)在事實的說明，所以使用一般現(xiàn)在時。而then一詞說明是與過去事實相反，所以從句應(yīng)該使用過去完成時，選C。
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