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
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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
单项选择题
After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes also repel things.
A．before
B．until
C．after
D．since
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