This ad almost made people mad when they ___TV.A.watch B.were watching C.to watch D.watching为什么

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This ad almost made people mad when they ___TV.A.watch B.were watching C.to watch D.watching为什么
This ad almost made people mad when they ___TV.A.watch B.were watching C.to watch D.watching为什么

This ad almost made people mad when they ___TV.A.watch B.were watching C.to watch D.watching为什么
B.
when引导时间状语从句,they主语排除无谓语的C,D.
A现在时,主句...made .是过去时,排除A

B.were watching