ontenyearsofobservationandstud

____ on ten years of observation and study, the story shows that everyone dreams every night, whether they realize it or not.

A．Basing	B．Based
C．Being based	D．Having based

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A．Whatever, no such thing

B．What, not such thing

C．However, no such thing

D．how, not such thing

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She always comes to our help when we get into trouble____ she is very busy.

A．ever since	B．once
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A．however	B．whatever
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A．while	B．before
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—I wonder how much you charge for your services.
—The first two are free the third costs $30.

A．while	B．until
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