单项选择题

The Olympic Games______ held ______ four years.

A．are; each
B．is; every
C．is; each
D．are; every
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单项选择题
Earthworms occur ______ adequate moisture and food and the necessary soil conditions are found.
A．and
B．whenever
C．however
D．whatever
单项选择题
The tree, the branches ______ are almost bare, is a very old one.
A．whose
B．in which
C．of which
D．which
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