--- Oh, no! It’s ten to seven already and I’ll be late. --- . That clock is half an hour

--- Oh, no! It’s ten to seven already and I’ll be late.
--- . That clock is half an hour fast. You have enough time to go there.
A. Hurry up
B. Look out
C. Watch out
D. Don’t worry

A. Hurry upB. Look outC. Watch out(答案→)D. Don’t worry解析：考查情景交际。“噢，不！差七分钟就十点了，我要迟到了。”“别担心。那个表快半个小时。你有足够的时间去那里。”A“快点”；B“小心”；C“小心”；D“别担心”。故选D。

就是这个解释