单项选择题

Hello! I ____ you were in London. How long have you been here

A．don’t know
B．hadn’t known
C．didn’t know
D．haven’t known
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单项选择题
Who is the speaker（）

A．A radio announcer.
B．A police officer.
C．A taxi driver.
单项选择题
You ____ be mad if you think Jake is going to lend you any money.
A．need
B．should
C．must
D．can
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