—Hey, Jack. Waste paper mustn’t ________ here.
—Sorry, I won’t do that again.
| A．throw | B．be thrown | C．be throwing | D．to throw |
—Hey, Jack. Waste paper mustn’t ________ here.
—Sorry, I won’t do that again.
| A．throw | B．be thrown | C．be throwing | D．to throw |
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