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
Mrs. Douglas unknowingly left a package ______ on the shop counter.
A．laying
B．to lie
C．laid
D．lying
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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