单项选择题

Not until I began to work ______ how much time I had wasted.

A．didn't I realize
B．did I realize
C．I didn't realize
D．I realize
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Alice received an invitation from her boss, ______came as a surprise.
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B．that
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It is ten years ______Miss Green returned to Canad
A． thatB. whenC. sinceD. as
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