单项选择题

I was just to get up ______ a knock was heard on my door.
A) as C) while
B) when D) since
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单项选择题
The rain ______, the soldiers continued their march. A) stopping C) stopped B) having stopped D) being stopped
The rain ______, the soldiers continued their march.
A) stopping C) stopped
B) having stopped D) being stopped
单项选择题
The medicine has many functions, ______ are unknown to us. A) some of which C) that some of them B) of which some of them D) which of them
The medicine has many functions, ______ are unknown to us.
A) some of which C) that some of them
B) of which some of them D) which of them
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