题目内容
-Must I clean the classroom now, Miss Wang?
-No, you needn't.It ________ by Bill.
[ ]
A.
is cleaning
B.
should be clean
C.
was cleaned
D.
has been cleaned
答案:D
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题目内容
-Must I clean the classroom now, Miss Wang?
-No, you needn't.It ________ by Bill.
is cleaning
should be clean
was cleaned
has been cleaned