问题
选择题
--- 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
答案
答案：D
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。