单项选择题

Anyone can borrow books from the library（）he keeps them clean and returns them in time

A．even if
B．so that
C．as long as
D．unless

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单项选择题

The old man had four children, all of（）died during the Civil War.

A．them
B．whom
C．which
D．that

单项选择题

I（）get on the bus when I heard someone calling me from behind.

A．was
B．was going to
C．would
D．was about to

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