Temperature sensing protective devices operate a control circuit which can ______the current when the device reaches a predetermined temperature.
A.
switch off
B.
switch on
C.
operate
D.
无
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【单选题】Tourists become perplexed because they dont know street names are posted on the side of buildings, rather than on signs. The underlined part means______.
【简答题】We didn’t know where it was ________ the other tourists in our group stayed for the night until the tsunami was over. A.that B.which C.when D.why