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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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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Who were the first watercolor artists?A.Early cave dwellers.B.Italian fresco artists.C.Flemish masters.D.Eighteenth-century English artists.
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