问题补充：
---Make sure that you will come here on time. --.
A. Certainly, I will
B. Don worry.
C. Thats OK.
D. Of course ,I can
答案：
(答案→)A. Certainly, I will
B. Don worry.
C. Thats OK.
D. Of course ,I can
解析：句意：确保你能按到到达。当然，我回单。A是的，我会的。B别担心C没关系。D当然，我能。时态是将来时，将来会的，故选A。
