单项选择题

Remember to try to avoid ______mistakes in grammar when you write a composition.

A．to make
B．making
C．having made
D．to be made
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单项选择题
______made her disappointed was her son's failure in the exam.
A．How
B．What
C．That
D．Why
单项选择题
Because of the terrible weather, the mountain climbers decided to put off the plan______ the next weekend.
A．at
B．in
C．on
D．until
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