单项选择题
These plants are rather difficult（）
A.to look after
B.to be looked after
C.being looked after
D.looking after
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The act of speaking will also help to improve listening comprehension（）
A.to some way
B.in the way
C.to some extent
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A.up
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It was well known that Thomas Edison（）the electric lamp.
A.invented
B.discovered
C.found
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