单项选择题

We look forward to________ to the opening ceremony.

A．invite
B．be invited
C．having been invited
D．being invited
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单项选择题
In a developed country, people will perhaps go out of work if the birthrate_________.
A．goes up
B．is decreasing
C．remains stable
D．is out of control
单项选择题
The difference between the control group and the experimental group was_________.
A．the training that parents received
B．the age of the children
C．tile books that were read
D．the number of the children
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