学位英语考试模拟试题精选：词汇语法96

 You see the lightning _____ it happens, but you hear thunder later.

A) the instant

B) for an instant

C) on the instant

D) in an instant

答案为"A"。句意为"闪电一发生你就可以看见，但要再过一会儿才听到雷声。"