—Tomreallyworkedhardathisstudythisterm.   —Yes.That's

問題詳情：

— Tom really worked hard at his study this term.   

— Yes. That's _______ he did better in his test.

      A. because         B. why                    C. what                D. how

【回答】

B

知識點：連詞

題型：選擇題