单项选择题
Not having been discovered,many laws of nature actually exist in nature.
A.虽然许多自然界的规律尚未被发现,但它们确实存在于自然界中。
B.存在大自然中的很多法律还没有被科学界发明出来。
C.许多自然界的规律实际上存在于自然界中,尽管不能被发现。
D.尽管很多自然界的规律没有被找出,但是这些规律实际上存在于自然界中。
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单项选择题
When we speak,sound waves begin to travel and go in all directions.
A.当人们说话时,声音向四面八方传开。
B.当我们说话时,声音就开始传播,并且向四面八方传开。
C.当我们说话时,声波开始传递,而且向四面八方传播。
D.当说话时,声波开始旅行,并且走向四面八方。
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单项选择题
Three new buildings ______ on the campus by the end of this year.
A.will be built
B.will have been built
C.have been built
D.are going to be built
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