there are a lot people in the shopping mall today than yesterdaya lot _______A.of B most Cless D more

there are a lot people in the shopping mall today than yesterday
a lot _______
A.of B most Cless D more

答案D
因为后面有than说明是比较级.
a lot是用来形容所填的词,既然a lot 表示多的意思,应该所填比较级也代表多,即more