题文
—Excuse me．what’s this for？
—It’s a cleaner and it________to pick up dirt．
| A．uses |
| B．is used |
| C．is using |
| D．used |
—Excuse me．what’s this for？
—It’s a cleaner and it________to pick up dirt．
| A．uses |
| B．is used |
| C．is using |
| D．used |
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