THEY/ BE/ HAVE/ UNTIL/ IT/ TO /THE/ REPAIRD/ WON’T /BEEN /SAFE /US...

45. - BAI TAP TRAC NGHIEM TA 9
BAI TAP TRAC NGHIEM TA 9

45. they/ be/ have/ until/ it/ to /the/ repaird/ won’t /been /safe /use/stairs/./

A. The stairs have been repaired until they won’t be safe to use it .

B. It won’t be safe to use the stairs until they have been repaired.

C. It have been safe to use the stairs until they won’t be repaired.

D. It won’t be safe to use until they have been repaired the stairs .