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
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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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单项选择题
Without computers，we ______ the tremendous medical advancement in the last few decades.
A．would not make
B．will not have made
C．could not make
D．couldn’t have made
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