将下列句子改为被动语态 He bought a bike t将下列句子改为被动语态1.He bought a bike two days ago .A bike（）（）two days ago2.We must send more satellites into space More satellites （）（）（）into space3.Scientists may clone humans some dayHumans（）（）（）（）scientists some day 4.He can’t finish his work in such a short time.His work（）（）（）in such a short time
问题描述：
将下列句子改为被动语态 He bought a bike t
将下列句子改为被动语态
1.He bought a bike two days ago .A bike（）（）two days ago
2.We must send more satellites into space
More satellites （）（）（）into space
3.Scientists may clone humans some day
Humans（）（）（）（）scientists some day
4.He can’t finish his work in such a short time.
His work（）（）（）in such a short time
答
was bought
must be sent
mat be cloned by
can' t be finished
答
1 was bought
2 must be sent
3 may be cloned by
4 can't be finished
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答
was bought
must be sent
may be cloned by
can't be finished