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
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We find such shrubs ______ will best stand up to (抵御)hard weather.
A．which
B．as
C．what
D．who
单项选择题
An old friend from abroad, ______ I was expecting to stay with me, telephoned from the airport.
A．that
B．which
C．whom
D．who
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