问题补充：
Many students don want themselves to doing homework.
A. keep busy; too much
B. be kept busying; much too
C. be kept busy; too much
D. being kept busy; too much
答案：
A. keep busy; too much
B. be kept busying; much too
(答案→)C. be kept busy; too much
D. being kept busy; too much
解析：本题一是考查固定短语“keep sb.busy doing sth.”；一是考查too much修饰不可数名词。
