单项选择题

By the time you came back yesterday, they ______ for London.

A．have left
B．left
C．had left
D．leave
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单项选择题
The book is ______ more interesting than the one I sent you last year.
A．rather
B．so
C．much
D．very
单项选择题
Either of you ______ able to move that stone.
A．are
B．is
C．have been
D．be
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