To our great joy, his health has improved .
A. a good many
B. a great deal
C. a large amount
D. a large quantity
网友回答
A. a good many
(答案→)B. a great deal
C. a large amount
D. a large quantity
解析：考查短语辨析。a good many 许多，后修饰可数名词复数，a great deal 副词，大量，非常，C和D后加of 才能构成短语，句意：使我们非常高兴的是，他的健康大大提高了。所以选B。