问题
选择题
Your trousers____ dirty.You must have____ washed.
A．is;il
B．are;it
C．are;them
D．is;them
答案
答案：C
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Your trousers____ dirty.You must have____ washed.
A．is;il
B．are;it
C．are;them
D．is;them
答案：C