the new machine can ____ automaticallya.shut up b.shut off c.shut down这3个词组都有关闭的意思,可为什么选B?有什么区别他们之间?

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thenewmachinecan____automaticallya.shutupb.shutoffc.shutdown这3个词组都有关闭的意思,可为什么选B?有什么区别他们之间?thenewmach

the new machine can ____ automaticallya.shut up b.shut off c.shut down这3个词组都有关闭的意思,可为什么选B?有什么区别他们之间?
the new machine can ____ automatically
a.shut up b.shut off c.shut down
这3个词组都有关闭的意思,可为什么选B?有什么区别他们之间?

the new machine can ____ automaticallya.shut up b.shut off c.shut down这3个词组都有关闭的意思,可为什么选B?有什么区别他们之间?
shut off
v.
关掉,切断
shut down
v.
(把窗子等)放下关下,[机](使)机器等关闭,停车
其实我觉得C也可以,答案并不是唯一的.学英语不可以太死板哦

B shut off the motor. 固定用法
shut up 闭嘴
shut down 关机,

机器用on/off 表示启动/关闭, 所以是B
C也可以,没有B好

C: shut down!!!
怎么能用shut off呢???
turn off 还差不多!!

应该是shut down
shut off是关掉、切掉的意思,一般都是shut off sth,人做主语的比较多。
shut down指机器关闭的意思,用在这里比较妥当,e.g. The computer always shut down itself.
shut up是闭嘴的意思。

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