单项选择题

Mike didn't start ______ the importance of a foreign language till he graduated from school.

A．knowing
B．to know
C．know
D．to have known
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______ 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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The role that China plays in world affairs ______ getting more and more important.
A．have been
B．will be
C．is
D．are
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