题目内容

They have made so great progress      .
A．three years agoB．for three years
C．in the past three yearsD．before three years
C
考查时态。“in/over/for+一段时间”常和现在完成时连用。A用于一般过去时。句意“在过去的三年里，他们已经取得了如此大的进步。”故选C。
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