It is know to all that it takes years of ( )practice to gain the skill of( )expert.
题目
It is know to all that it takes years of ( )practice to gain the skill of( )expert.
Aa;the
B/;an
Ca;an
D/;a
答案
B.
years of practise(practise不可数)类似的years of hard work
expert原因开头加a.
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