单项选择题

Now we can fly to Tokyo. There was a time ______ we had to take a boat.

A．how
B．what
C．why
D．when
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单项选择题
The size of the audience, ______ we had expected, was well over twenty thousand.
A．whom
B．which
C．as
D．that
单项选择题
Chinese historians tried to ______ a balance between the data of history and their significance.
A．produce
B．upset
C．strike
D．tip
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