【开放英语4(英语II(2))-1162网上形考机考题库】 You _____ buy some reference books when you go to college.

【开放英语4(英语II(2))-1162网上形考机考题库】 You _____ buy some reference books when you go to college.
A. must
B. will have to
C. must to
D. have to