Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.
A．what is calledB．which is calledC．what it is calledD．which it is called
A
本題考查名詞性從句。介詞in后面的賓語(yǔ)從句中缺少主語(yǔ)，故用what做主語(yǔ)，故選A。
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