They have made so great progress      .
A．three years agoB．for three years
C．in the past three yearsD．before three years
C
考查時態(tài)。“in/over/for+一段時間”常和現(xiàn)在完成時連用。A用于一般過去時。句意“在過去的三年里，他們已經(jīng)取得了如此大的進(jìn)步。”故選C。
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