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求解2题英语My sister didn't go to the party last night because sh

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求解2题英语
My sister didn't go to the party last night because she_____the baby for her friend until 9:30
A must have looked after
b would have to look after
c had to look after
d should hae looked after
He has written several books,but his last works_______well known among his friends.
A have
b have been
c is
d are
求解2题英语My sister didn't go to the party last night because sh
1,C
因为她必须照看她朋友的孩子,而不是什么“一定在照看”,或者“本应该照看”或者“本要照看”之类的
2,C
works在做两种解释的时候表示单数概念,一个是工厂,比如iron works 钢铁工厂;还有一个就是“作品”.这时候谓语要用单数