单项选择题

We should be strict ______ ourselves.

A．to
B．for
C．with
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单项选择题
The old man used to ______ under the tree for hours after supper.
A．sit
B．sitting
C．seat
单项选择题
I ______ a letter to my brother this time yesterday.
A．wrote
B．had written
C．was writing
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