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单项选择题

I was about to leave my house ______ he came.

A. while
B. as
C. when
D. since
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单项选择题None of us expected the president to ______ at the party. We thought he was still in hospital.

A. turn in
B. turn down
C. turn out
D. turn up

单项选择题I was in the kitchen ______ something when the doorbell rang. A) cooked B) cook C) to cook D) cooking

I was in the kitchen ______ something when the doorbell rang.
A) cooked B) cook C) to cook D) cooking