Once _,the clock will last a month and keep good time.
问题描述:
Once _,the clock will last a month and keep good time.
A.start B.started
C.to start D.starting
start做启动或发动时不是用主动表被动吗?
答
B 省略了一些.完整的是once it is started(一旦被启动),它就……