摘要：3．Some boys are swimming in the river.
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There are some boys ________ in the river.
A. swimming B. to swim C. are swimming D. is swimming
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There are some boys ________ in the river.
| A．swimming | B．to swim | C．are swimming | D．is swimming |
There are some boys ________ in the river.
- A.swimming
- B.to swim
- C.are swimming
- D.is swimming
There are some boys ________ in the river.
查看习题详情和答案>>
| A．swimming | B．to swim | C．are swimming | D．is swimming |
There are some boys ________ in the river.
| A．swimming | B．to swim | C．are swimming | D．is swimming |