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
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单项选择题
Please have your doctor __ that prescription.
A．signed
B．to sign
C．signing
D．sign
单项选择题
We've bought a new house. We'll move in soon and we need to buy __ furniture.
A．some other
B．another
C．other
D．others
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