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问题: :(单选)The river is very long and it is about( ).

:(单选)The river is very long and it is about( ).
A.10-metres long B.20-metre wide
C.20 metres' wide D.10 metres deep
E.10-metre long

解答:

---------E
前句说:The river is very long,(这条河很长,后面一定是说多长),这样只能在A,E中选择。

这种形式在metre后不用复数,所以选择E

如果数字10后无短横线,metre用复数形式