单项选择题

You (have heard) (from) him (since) last month, (have) you().

A. have heard
B. from
C. since
D. have

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问答题

Water is so low in the canals of northern France that waterway traffic is forbidden except on weekends.

问答题

尽管这个法律按当今的标准来看是很滑稽的，但它却表明很久以前人们就已经估计到这一点了。