单项选择题

The mother said she would _____________her son washing the dishes if he could finish his assignment before supper.

A． let down
B． let alone
C． let off
D． let out
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单项选择题
Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed________.
A．had produced
B． have been produced
C．would have produced
D．had been produced
单项选择题
Just as the soil is a part of the earth, ________________ the atmosphere.
A．as it is
B． the same is
C．so is
D．and so is
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