I want to know all negative effects the Internet           our lives.
A．has inB．have inC．has onD．have on
C
本題考查主謂一致和介詞。此題中the Internet           our lives.是定語從句，省略了引導(dǎo)詞。定語從句的主語是the Internet，故謂語動詞have用單數(shù)形式has。省略的引導(dǎo)詞代替先行詞effects做has的賓語，構(gòu)成have effect表示“對……有影響”，介詞要用on。
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