单项选择题

Sam did nothing else than ______ when he saw the old lady fell down on the ground.

A．stand by
B．standing by
C．stood by
D．stood up
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单项选择题
Many a plan ______ to fight against pollution.
A．have been worked out
B．have been worked on
C．has been worked out
D．has been worked on
单项选择题
All too ______ it was time go back to work after the Spring Festival.
A．often
B．quick
C．soon
D．fast
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