单项选择题

Many patients don't take drugs ______ directed.

A．like
B．so
C．which
D．as
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单项选择题
Look, the trees are fallen; there ______ a strong wind last night.
A．must be
B．should have been
C．must have been
D．could be
单项选择题
The Greens bought a new house but ______ will need a lot of work before they can move in.
A．they
B．it
C．one
D．which
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