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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. Mrs Smith had ____8-year-old son who has ____ gift for painting. He has won two national prizes.
A. a, a B. an, the C. an, a D. the, a
22.-----Look, Tom has fallen asleep.
-----Oh, he _____ too late yesterday evening.
A. might stay up B. should have stayed up
C. could stay up D. must have stayed up
21. Mrs Smith had ____8-year-old son who has ____ gift for painting. He has won two national prizes.
A. a, a B. an, the C. an, a D. the, a
22.-----Look, Tom has fallen asleep.
-----Oh, he _____ too late yesterday evening.
A. might stay up B. should have stayed up
C. could stay up D. must have stayed up
