---When will they ?- the seventh of July.A. arrive OnB. arrive at OnC. arrive in InD

问题补充：

---When will they ? --- the seventh of July.

A. arrive, On

B. arrive at, On

C. arrive in, In

D. arrive, In.

答案：

(答案→)A. arrive, On

B. arrive at, On

C. arrive in, In

D. arrive, In.

解析：确指某一天时要用介词on