问题标题:
thequestionis---tolandonthegrasslandA.ifitissafeB.ifisitsafeC.whetherisitsaftDthequestionis---tolandonthegrasslandA.ifitissafeB.ifisitsafeC.whetherisitsaftD.whetheritissafe
问题描述:

thequestionis---tolandonthegrasslandA.ifitissafeB.ifisitsafeC.whetherisitsaftD

thequestionis---tolandonthegrasslandA.ifitissafeB.ifisitsafeC.whetherisitsaftD.whetheritissafe

何宏宏回答:
  选D   只有引导宾语从句时,IF和WHETHER是可以通用.   主语或表语从句只能由WHETHER引导,IF不可以的.但IF还可以引导条件状语从句.
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