单项选择题

While they were away on vacation, they allowed their mail to accumulate at the post office.

A．be delivered
B．pile up
C．get lost
D．be returned
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单项选择题
The most famous Shoshone Indian was Sacagawea—the woman who accompanied Lewis and Clark on their exploration of the upper Missouri River.
A．traveled with
B．argued with
C．defended
D．avoided
单项选择题
Weed killers must be chosen and applied with great care to avoid damage to adjacent trees and shrubs.
A．indigenous
B．nearby
C．perennial
D．similar
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