问题补充:
---Whydidn’tyouresponsetotheirgreeting?---Sorry.I______they______tome.A.don’t realize; are wavingB.don’t realize; were wavingC.didn’t realize; were wavingD.didn’t realize; are waving
答案:
C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。