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

It is requested that the engineer（）the design immediately.

A．worked out
B．worked out
C．to work out
D．work out

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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