关于被动语态的单句改错1.theyweredisguisingincostumessothatwedidn'trecognizethem2.everythinghadpreparedbeforetheexperimentbegan3.theworld'ssuppliesofcopperarebeengraduallyexhausted4.anotherChineseman-madesatellite

Question

关于被动语态的单句改错
1.they were disguising in costumes so that we didn't recognize them
2.everything had prepared before the experiment began
3.the world's supplies of copper are been gradually exhausted
4.another Chinese man-made satellite will send to the outer space very soon

Answer 1

1.they were disguised in costumes so that we didn't recognize them
2.everything had been prepared before the experiment began
3.the world's supplies of copper have been gradually exhausted
4.another Chinese man-made satellite will be sent to the outer space very soon