单项选择题

You promised her a letter; and you ought to ________ to her days ago.

A．be writing
B．be written
C．write
D．have written
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单项选择题
It was vital that we ________ every measure to protect the beautiful scenery around the lake.
A．have to take
B．take
C．must take
D．will take
单项选择题
We warned the children time and again _________ the electric lamp.
A．not to touching
B．should not touch
C．not touch
D．not to touch
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