单项选择题

It was in 1939 （） the World War Ⅱ broke out.

A．when
B．in which
C．which
D．that

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单项选择题

I wanted to build a bookcase, but I could not make. （） of the instructions.

A．understanding
B．sense
C．reality
D．sight

单项选择题

Mrs. smith, （） is a retired teacher, does volunteer work at the hospital.

A．she
B．who
C．as
D．that

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