单项选择题

After ______ on a merry-go-round, she started to feel dizzy and had to lie down.

A．to have ridden
B．redden
C．riding
D．to ride
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单项选择题
Each plant and animal by natural tendency, ______ far more seeds and eggs and seedlings and young, than is necessary to maintain ______ population.
A．is to produce ... their
B．produces ... its
C．produces their
D．produce... their
单项选择题
As to the lost world of Egypt, we know nearly everything ______ to know.
A．there is
B．it is
C．which is
D．what is
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