单项选择题

A: I'm sorry I'm calling you so late.
B: ______okay.

A．This is
B．You' re
C．That's
D．I'm
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单项选择题
If I hadn't stood under the ladder to catch you when you fell, you ______ now.
A．wouldn't be smiling
B．couldn't have smiled
C．won't smile
D．didn't smile
单项选择题
In 1914, an apparently insignificant event in a remote part of Eastern Europe ______ Europe into a great war.
A．inserted
B．imposed
C．pitched
D．plunged
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