____the safety of gas, the government has checked the city’s gas supply system thoroughly.

A. To ensure           B. Ensuring        C. Having ensured        D. To have ensured

A


解析:

分詞作狀語，表示動作發(fā)生的時間、原因、方式、結(jié)果，或表示伴隨狀況、補充說明;

動詞不定式作狀語主要表示目的，還可以表示原因、結(jié)果（用于only + to do）. 此處為目的狀語。

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