Frank with his two sisters London by train which at 8:30 next morning.A. is leaving for

问题补充：

Frank, with his two sisters, London by train which at 8:30 next morning.

A. is leaving for; will leave

B. are leaving for; leaves

C. is leaving for; leaves

D. will leave for; will leave

答案：

A. is leaving for; will leave

B. are leaving for; leaves

(答案→)C. is leaving for; leaves

D. will leave for; will leave

解析：考查主谓一致。With 连接连个主语时，取决于前者，故用is leaving for用进行时态表将来，第二空表示列车时刻表时，用一般现在时态表将来，故选C。