题目内容

When you (knock) at the door yesterday,I (do) some washing.

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When I arrived at his office,he _____on the phone.

A. was speaking
B. spoke
C. had been speaking
D. had spoken

自动起动停车技术就是致力于最大限度减少 ______ 时燃油的损耗。

自动起动与自动停机一般是由 ______ 控制的。

自动起停系统的和需要承受较大的压力。