your trousers _____dirty,you must have ____washeda.is;itb.are,itc.is.themd.are,them

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your trousers _____dirty,you must have ____washeda.is;itb.are,itc.is.themd.are,them

your trousers _____dirty,you must have ____washeda.is;itb.are,itc.is.themd.are,them
your trousers _____dirty,you must have ____washed
a.is;it
b.are,it
c.is.them
d.are,them

your trousers _____dirty,you must have ____washeda.is;itb.are,itc.is.themd.are,them
C
trousers是复数,并且一般情况下裤子都是以trousers的形式出现,不作为一个整体处理;要说一条裤子我们用a pair of trousers.
诸如此类的主要还有一个glasses,眼镜;一副眼镜是:a pair of glasses