单项选择题

It was hot work, but () Susan would bring us something cold to drink.

A、every so often
B、every how
C、each so often
D、each now and again
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单项选择题
Now let us analyze the flight of a spacecraft () of what we have learned about motion and gravity.
A、on the condition
B、on terms
C、under the condition
D、in terms
单项选择题
This college is () Prof Wang.
A、at the service of
B、at service of
C、in charge of
D、in the charge of
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