单项选择题

Mr. White______at 8:30 for the meeting, but he didn't show up.

A．should have arrived
B．should arrive
C．should have had arrived
D．should be arriving
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单项选择题
Given these conditions, there will not be______room left in one's brain for ______rational (理智的) thought.
A．a; the
B．/; a
C．the; /
D．/; /
单项选择题
It's too late to go out, ______, it's going to rain.
A．otherwise
B．besides
C．however
D．therefore
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