单项选择题

What has happened

A．In a post office.
B．At an insurance agency.
C．On an airplane.
D．In a moving company.
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单项选择题
A．After they do the washing up.B．After the man gets his cigarettes.C．After the man drives the woman to the phone.D．After they get back from the phone box.
A．After they do the washing up.
B．After the man gets his cigarettes.
C．After the man drives the woman to the phone.
D．After they get back from the phone box.
单项选择题
A．To illustrate what a great scientist he was.B．To explain why lab equipment must be cleaned carefully.C．To emphasize the need for proper precautions.D．To show how theoretical chemistry has advanced.
A．To illustrate what a great scientist he was.
B．To explain why lab equipment must be cleaned carefully.
C．To emphasize the need for proper precautions.
D．To show how theoretical chemistry has advanced.
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