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

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

选项 A、the instant
B、for an instant
C、on the instant
D、in an instant

答案A

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,又如:She cried the instant she read the letter. (她一读那封信就哭了起来。)for an instant(=for a moment)“一瞬间”,如:I djdn’t recognize him for an instant.(我一时认不出他来了。)on the instant “立即,当即”,如:He refused me on the instant.(他当即回绝了我。)in an instant(=in a moment)“很快,马上”,如:He was told tO clear the room in an instant.(他被要求马上打扫房间。)
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