问题标题:
Thereisnodoubt_____spendingtoomuchtimesurfingtheInternetorwatchingTVcontributestonearsightednessaseriousproblemofyoungpeopleinmanycountries.A.whether
问题描述:

Thereisnodoubt_____spendingtoomuchtimesurfingtheInternetorwatchingTVcontributestonearsightednessaseriousproblemofyoungpeopleinmanycountries.

A.whether B.that

C.if D.which

郭民回答:
  B
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