There are about more than five ___________  "left-behind" students (留守学生) in China.
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A
million
B
millions
C
million of
D
millions of
推荐题目
The swimming pool is ________.
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A
50-metre long
B
50 metres long
C
long 50 metres
D
long 50-metre
Nowadays            of business letters are written in English.? 
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A
two-third
B
two-thirds
C
two-three
D
two-threes
_________ should not be allowed to go out at night. 
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A
Twelve-years-old
B
Twelve-year-olds
C
Twelveyearold
D
Twelveyearsolds