单项选择题

The Grand Canal began to be dug in _____.  A.
the Spring and Autumn Period  B.
the Sui Dynasty

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不定项选择
音节“lún”和“yún”中的韵母相同。
A．正确
B．错误
单项选择题
I never had to clean up after him. ( ), he did most of the cleaning. A. If any B. If anything C. If so D. If ever
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