单项选择题

In New England, stone walls are used ______.

A．to keep dangerous beasts out
B．to keep the farmer's cows from wandering away
C．to protect the farmer's fields from thieves
D．to provide comfortable living conditions for the farmer's family

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单项选择题

It was suggested that the agreement ______ before the end of the year.

A．be signed
B．was signed
C．would be signed
D．had been signed

单项选择题

No sooner had the students started out ______.

A．as the rain poured down
B．than the rain poured down
C．when the rain had poured down
D．then the rain poured down