单项选择题

This experiment ought to ______ last week.

A．be done
B．have been done
C．have done
D．do
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单项选择题
Nowhere else in the world ______ more attractive scenery than Switzerland.
A．you can find
B．has been found
C．can you find
D．you have found
单项选择题
Look what father ______ me when he came from work.
A．brought
B．took
C．carded
D．fetched
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