单项选择题

Don't put off till tomorrow ______ you can do today.

A．that
B．what
C．when
D．whether
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单项选择题
______ from the hilltop, the lake scenery is beyond description.
A．To see
B．Seeing
C．Having seen
D．Seen
单项选择题
______ for your laziness, you could have finished the assignment by now.
A．Had it not been
B．Weren't it
C．It were not
D．Had not it been
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