问题描述：
We ___the floor and ___the windows.
A will mop;cleaned
B moped;have cleaned
C mopped;cleaned
D have mopped;cleaned
说下原因.
如果要表示我们已经做完卫生了，and前后都要有have吗
A will mop;cleaned
B moped;have cleaned
C mopped;cleaned
D have mopped;cleaned
说下原因.
如果要表示我们已经做完卫生了，and前后都要有have吗
问题解答：
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