问题
选择题
— Why? Tom, your shirt is so dirty!
— Mum, I _____ my storeroom downstairs。
A．cleaned
B．have worked
C．was cleaning
D．have been cleaning
答案
答案：D
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— Why? Tom, your shirt is so dirty!
— Mum, I _____ my storeroom downstairs。
A．cleaned
B．have worked
C．was cleaning
D．have been cleaning
答案：D