"—have they studied English "They have studied English for three years.A:How long B:How soon

问题描述:

"—have they studied English "They have studied English for three years.A:How long B:How soon

A. How long 他们学习英语多久(多长时间)了?

答案选A:How long 有多久
问的是时间长久

A.接完成时或是过去时
B.接一般将来时
选A