Question

【题目】Tom realized that he ________ his physics book at home when he reached school.

A. left B. had left

C. was leaving D. leaves

Answer 1

【答案】B

【解析】

试题分析：句意：当Tom到学校时他意识到他已经把物理书丢在了家里。“意识到”是过去时，“把物理书丢在了家里”发生在过去的过去，即过去完成时。选出正确答案B。