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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单项选择题
He is an artist in ______ but not in reality.
A．surface
B．title
C．rank
D．name
单项选择题
Mrs. Douglas unknowingly left a package ______ on the shop counter.
A．laying
B．to lie
C．laid
D．lying
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