The speaker could hardly find safe ground______his arguments.A、on which to base

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问题 The speaker could hardly find safe ground______his arguments.

选项 A、on which to base
B、to base on
C、on the base
D、which to base on

答案 A

解析本句中定语从句所修饰的先行词safe ground在从句中做状语，应用关系代词which并把介词on前置。因此，只有A项正确。

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[originaltext]Itissometimesmoredifficulttogetairplanesoffthegroundin