In order to test how strong the tank was, the experts purposefully let the pressure inside continue
to _____ until it bursts.[ ]
A. come up
B. rise up
C. build up
D. raise
答案:C
In order to test how strong the tank was, the experts purposefully let the pressure inside continue
to _____ until it bursts.[ ]
A. come up
B. rise up
C. build up
D. raise
答案:C