—When do you have maths today? —We have mathshalf past ten this morning.A. inB. atC. onD.

问题补充：

—When do you have maths today?

—We have mathshalf past ten this morning.

A. in

B. at

C. on

D. to

答案：

A. in

(答案→)B. at

C. on

D. to

解析：考查介词：因为half past ten为点时间，而在具体的点时间前加介词at ，in后面接月份，年代，季节，on接具体的某一天，to是到了，故选答案为B