单项选择题

The ______ of this meeting is to discuss ways of protecting the environment.

A．idea
B．function
C．reason
D．purpose
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单项选择题
She didn't come to the party, though she ______ us she would.
A．offered
B．accepted
C．agreed
D．promised
单项选择题
Don't ______ to ask me if anything is not clear to you.
A．doubt
B．hesitate
C．mind
D．worry
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