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外语
Do not leave the building unless ______ to do so.
Do not leave the building unless ______ to do so.
admin
2013-06-17
18
问题
Do not leave the building unless ______ to do so.
选项
A、instructed
B、being instructed
C、are instructed
D、have instructed
答案
A
解析
除非得到指示,否则不要离开这座大楼。该题考点为分词的用法,主句为祈使句,省略了主语you,从句省略了主语you以及are(因 instruct与主语构成了动宾关系,故用instruct的过去分问,表被动)。
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0
大学英语四级
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