单项选择题

A．Coarse sand.
B．Being sad.
C．Calm water.
D．A stormy ocean.
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单项选择题
_________, many laws of nature actually exist.
A．Having not discovered
B．Not having discovered
C．Having not been discovered
D．Not having been discovered
单项选择题
_________did Jerome accept the job.
A．Because it was interesting work
B．The work was interesting
C．Only because it was interesting work
D．Only because it was interested work
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