Only through constant practice can the ability of using a foreign language be _______. 
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A
earned
B
acquired
C
gained
D
achieved
推荐题目
The Governor demanded that all the proposals _______ on May 1st.
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A
must be submitted
B
be submitted
C
submitted
D
were submitted
 Living in a city can’t ______ living in the country.
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A
be compared to
B
compare between
C
compare with
D
compare to