with the help of teachers,they have made great progress( )A three years agoB in the past three yearsC for three yearsD before three years

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with the help of teachers,they have made great progress( )
A three years ago
B in the past three years
C for three years
D before three years

为你提供精确解答
选【B】
A,是用于过去时态.
C,是用于延续性的动作.
D,这是用于过去时态.

选B,完成时的时间标志。A\D是过去式的时间标志。
C,他们取得巨大的进步已经三年了。
B,在过去的三年里,他们取得了巨大的进步。
B更接近