单项选择题

You cannot cancel your order（）you change your mind within three days.

A、as if
B、while
C、so that
D、unless

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单项选择题
The business talk（）next week when the CEO of your company comes.

A．was held
B．is being held
C．will be held
D．has been held
单项选择题
The computer program is designed for the（）of easy online reading.

A．experience
B．purpose
C．invitation
D．decision
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