单项选择题

She hoped that a long rest might ______ her in health.

A．improve
B．reform
C．strengthen
D．perfect
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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．wherever
单项选择题
We find such shrubs ______ will best stand up to (抵御)hard weather.
A．which
B．as
C．what
D．who
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