单项选择题

Johnson's younger brother, though 6 years old, is very quick () doing calculations.

A.of
B.on
C.in
D.by

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单项选择题
Sometimes someone will try to tell you something without () and saying it.

A.coming out right
B.coming right out
C.right coming out
D.out coming right
单项选择题
()found four-leaf clover is considered a lucky sign.

A.Rarely
B.It is rarely
C.The rarely
D.Despite its being rarely
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