--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 |
--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 |
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