单项选择题

The first ______ in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.

A．intervals
B．breaks
C．stages
D．periods
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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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