---Don't put the waste on the ground.
---Oh, I'm very sorry. I ________ the dustbin（垃圾箱） there.
| A．don't see | B．isn't seeing | C．didn't see | D．haven't seen |
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---Don't put the waste on the ground.
---Oh, I'm very sorry. I ________ the dustbin（垃圾箱） there.
| A．don't see | B．isn't seeing | C．didn't see | D．haven't seen |
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