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(shí)態(tài)!癷n/over/for+一段時(shí)間”常和現(xiàn)在完成時(shí)連用。A用于一般過去時(shí)。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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