问题
选择题
-You look upset.
-Yes, this is the first time I________ form home.
A．leave
B．left
C．have been away
D．is away
答案
答案：C
题目分析：考查固定句型：this is the first time+从句…，从句中用现在完成时，句意：这是我第一次离开家。选C.
点评：这个句型要是变成this was the first time+从句…从句中用过去完成时。