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 agoB in the past three yearsC for three yearsD before three years
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

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
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