2. By the time I walked into the classroom,the teacher teaching already. I was late.

   A. has started   B. had started

   C. started   D. was starting

2. B

2. B by the time后接從句用一般過去時(shí)，主句用過去完成時(shí)。

題目來源：2016年全品學(xué)練考九年級(jí)英語全一冊(cè)下新課標(biāo)人教版 > 單元過關(guān)測(cè)試十二

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