单项选择题
Televisions enable us to see things happen almost at the exact moment____.
A．which they are happening
B．they are happening
C．which they happen
D．they have happened
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单项选择题
I ________ to him because he phoned me shortly afterwards.
A．ought to have written
B．must have written
C．couldn’t have written
D．needn’t have written
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单项选择题
____in the past, at the moment it is a favorite choice for the wedding gown.
A．Unpopular has as white been
B．White has been as unpopular
C．Unpopular has been as white
D．Unpopular as white has been
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