单选题 Had the explosion broken out, the passengers in the plane should have been killed, for it was ______ timed with the plane's take-off.
A. spontaneously B. instantaneously C. simultaneously D. conscientiously

【正确答案】 C
【答案解析】[解析] 本题空格处是说与飞机起飞同时发生。C项“simultaneously同时地”符合题意。其他三项“spontaneously自发地，自然地；instantaneously瞬间地；conscientiously认真地”都不正确。