It how long the shock that explosions hit London transport system will stay in peoples h

问题补充：

It how long the shock that explosions hit London transport system will stay in peoples hearts.

A. abandons

B. considers

C. matters.

D. minds

答案：

A. abandons

B. considers

(答案→)C. matters.

D. minds

解析：考查动词辨析．句意为：袭击伦敦交通系统所带来的震惊在人们的内心会持续多长时间那是最要紧的．it系形式主语．matter:要紧．至关重要．