单项选择题

A．towards
B．against
C．without
D．out of
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单项选择题
A．thereforeB．howeverC．thoughD．thereby
A．therefore
B．however
C．though
D．thereby
单项选择题
A．professor and student.B．shop assistant and customer.C．librarian and reader.D．two friends.
A．professor and student.
B．shop assistant and customer.
C．librarian and reader.
D．two friends.
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