Eye doctors recommend that a child’s first eye exam ________ at the age of six months old.                    
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A
was
B
be
C
were
D
is
推荐题目
 _____ of the world’s books and newspapers are written in English.
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A
Three quarter
B
Three of quarters
C
Third fourths
D
Three fourths
All those second-hand goods are sold at ____ before.
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A
30% as lower price as
B
30% as low a price as
C
as 30% low price as
D
30% lower price than