单项选择题

______ the 1500's ______ the first European explored the coast of Californi

A． It was until ... thenB. It was not until ... whenC. it is until ... thatD. It was not until ... that
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单项选择题
The role that China plays in world affairs ______ getting more and more important.
A．have been
B．will be
C．is
D．are
单项选择题
— Where ______ — I got stuck in the heavy traffic. I ______ here earlier.
A．did you go; had arrived
B．have you been; would have been
C．were you; would come
D．are you; was
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