单项选择题

They considered（）impossible to get everything ready in such a short time.

A．what
B．that
C．it
D．them

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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

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

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