单项选择题

So far every means ______tried, but we have not come up with a solution to the problem.

A．is
B．has been
C．are
D．have been
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单项选择题
I had an appointment with my supervisor, ______I didn't know you were coming.
A．except
B．for
C．besides
D．in addition to
单项选择题
Not until my British friend came to China______ how densely populated the country is.
A．did he realize
B．he didn't realize
C．he realized
D．he could realize
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