单项选择题

Which of the following words is NOT a compound word

A．inefficient
B．breakthrough
C．grassland
D．keyhole
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I knew ______ Donald Trump, but not ______ famous one.
A．/; a
B．a; the
C．/; the
D．the; a
单项选择题
She teaches in a remote area, where ______ a lake.
A．lies
B．lays
C．does lie
D．does lay
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