题文
Be careful not to knock anything _________ the floor when you ________ the bookshelf.
| A．off, pass | B．down, passed |
| C．onto, pass | D．onto, past |
Be careful not to knock anything _________ the floor when you ________ the bookshelf.
| A．off, pass | B．down, passed |
| C．onto, pass | D．onto, past |
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