_______, glasses can correct most sight defects in healthy eyes.

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问题 _______, glasses can correct most sight defects in healthy eyes.

选项 A、If well fitted when
B、Well fitted if
C、Well fitted when
D、When well fitted

答案D

解析 时间状语从句的缩略式。例句请参阅第一套模拟题注释74。
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