单项选择题

An earthquake is a shaking of the ground ______ when masses of rock beneath the surface of the earth change position.

A．which occurring
B．it occurs
C．and therefore occurring
D．that occurs
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单项选择题
They stood gazing at the happy ______ of children playing in the park.
A．perspective
B．view
C．landscape
D．scene
单项选择题
You ______ all these parcels yourself. The shop would have delivered them if you had asked them.
A．didn't need to carry
B．didn't have to carry
C．could not carry
D．needn't have carried
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