单项选择题

Not until his father came back,（）to bed.

A．did the boy go
B．went the boy
C．the boy goes
D．the boy did go

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单项选择题
My sister has been working in that factory ever（）it was set up.

A．since
B．while
C．when
D．fill
单项选择题
Hurry up! Otherwise the play（）by the time we got there.

A．will start
B．will have started
C．has started
D．starts
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