题目内容

All of Manhattan, parts of Brooklyn and Queens are blacked out, and people have no idea ___ it’s coming back on.
A．thatB．whenC．howD．where
B
四个选项分别表示定语从句，时间状语从句，方式状语从句和地点状语从句。整句话大概意思是：在整个曼哈顿岛上，布鲁克林和皇后区的部分地区被封闭了，人们不知道何时（WHEN）恐怖分子会再次来袭。故选B。
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