--- Do you know what Tom does all day ?
---- I know he spends at least as much time watching TV as he his lessons.
A. is doing
B. does
C. spends to do
D. does doing
网友回答
A. is doing
B. does
C. spends to do
(答案→)D. does doing
解析：本题考查状语从句。题中does doing his lessons中的does相当于spends much time; 选项C spends 是个及物动词，因其后面无宾语，故不用。选D。