单项选择题

No one would have time to read or listen to an account of everything ______ going on in the world.

A．it is
B．as is
C．there is
D．what is
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单项选择题
______ the 1500's ______ the first European explored the coast of California.
A．It was not until/then
B．It is until/that
C．It is not until/when
D．It was not until/that
单项选择题
Only by listening, speaking, reading and writing ______.
A．can English be mastered
B．can we master English
C．English can be mastered
D．we can master English
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