2. 专升本
  3. At no time in history______ such a mass migration of people from countryside to city as ishappening now.

At no time in history______ such a mass migration of people from countryside to city as ishappening now.

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问题 At no time in history______ such a mass migration of people from countryside to city as ishappening now.
选项 A、there has been
B、has there been
C、there has
D、has there
答案B
解析
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