单项选择题

I don't know why I______.

A．have been chosen
B．am chosen
C．had chosen
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单项选择题
______ his boring speech for over an hour, the speaker waited for applause from the audience.
A．Before
B．Behind
C．After
单项选择题
Johnson had a toothache,______
A．didn't he
B．hadn't he
C．did he
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