从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21.—You didn’t get hurt at all in the traffic accident?
— .I was a lucky dog.
A.No problem. B.Good heavens C.I’m afraid not D.I don’t think so
22. I know little about architecture, I find that building very impressive.
A.Since B.As C.If D.While
23.The food， good,was soon sold out when it was taken to the market.
A.tasted B.being tasted C.tasting D.having tasted
