单项选择题

"Has he come back .... Yes, he __ back for three days.

A．has come
B．had come
C． is
D．has been
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单项选择题
A biologist does not merely describe organisms, but tries to learn __ act as they do.
A．what to cause them
B．what cause to them
C．what causes them to
D．causes them to what
单项选择题
Please have your doctor __ that prescription.
A．signed
B．to sign
C．signing
D．sign
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