单项选择题

Not until three years ago ________ to work outside.

A．he began
B．he begins
C．began he
D．did he begin
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单项选择题
She stumbled and ________ the coffee.
A．spoiled
B．spilled
C．poured
D．splashed
单项选择题
When we drove to the country, we saw many ________.
A．herds of cattles
B．herds of cattle
C．herd of cattle
D．herd of cattles
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