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

（）that called this morning？

A．Who was
B．Who it was
C．Who was him
D．Who was it

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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