问题
How was your vacation—It was terrible. I had to stay at home and _________ for the tests.
A:A number of; larger and larger
B:The number of; less and less
C:The number of; smaller and smaller
D:A number of; smaller and smaller;
B:The number of; less and less
C:The number of; smaller and smaller
D:A number of; smaller and smaller;
正确答案是：
