问题补充:
. —Why didn’t you response to their greeting?
—Sorry. I they to me.
A. don’t realize; are waving
B. don’t realize; were waving
C. didn’t realize; were waving
D. didn’t realize; are waving
答案:
A. don’t realize; are waving
B. don’t realize; were waving
(答案→)C. didn’t realize; were waving
D. didn’t realize; are waving
解析:这题考查时态,句意是:--你为什么不回答他们的问候?--对不起,我没意识到他们在向我挥手。所以是过去没意识到,另外主句是过去时,从句也是相应的过去时。选C。