问题补充：
new products have been successfully made in the factory.
A. A great deal of
B. A number of
C. The number of
D. A great amount of
答案：
A. A great deal of
(答案→)B. A number of
C. The number of
D. A great amount of
解析：a number of+可数名词意为:许多,谓语动词用复数.
700字范文，内容丰富有趣，生活中的好帮手！
