2. 外语
  3. ______a few years ago, the existence of sexual harassment in many businesses was scarcely acknowledged.

______a few years ago, the existence of sexual harassment in many businesses was scarcely acknowledged.

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问题 ______a few years ago, the existence of sexual harassment in many businesses was scarcely acknowledged.
选项 A、Before
B、Since
C、Until
D、Up to
答案C
解析 本题考查连词。before“在……之前”，后面常跟时间点，不能与ago连用，since“自从”，常与时间点连用，until“直到……才”，表示动作在时间点结束，up to“多达”。根据题意，本题选C。
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