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【单选题】
作业8：在一般模式下，删除4个单词用哪个命令？A.
4xw
B.
4dw
C.
wwww
D.
d4
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举一反三
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A.
We don't need to worry too much about bacteria everywhere in our life.
B.
Antibacterial products for the home are found to be effective.
C.
The TV advertisement the writer mentioned is a total failure.
D.
The existent bacteria pose a threat only to the very young and very old.
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A.
contradiction
B.
entailment
C.
synonym
D.
Presupposition
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