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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单项选择题
May this book ______ to enhance the understanding and friendship between the two peoples.
A．help
B．helps
C．will help
D．should help
单项选择题
Mary has a curious expression on her face as though she ______ about something.
A．is smiling
B．were smiling
C．smiles
D．has smiled
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