第23题: [单项选择]You see the lightning ______ it happens, but you hear the thunder later. A. the instant B. for an instant C. on the instant D. in an instant 参考答案:A 答案解析:[解析] 词组辨析。instant意为“瞬间,刹那”,时间比moment更短,但用法与moment基本一致。the instant (=as soon as)“一……就……”,符合题意,为正确答案,又