The satellite launching center was built in a secret place,around __ high mountains.A which was B it was C which were D them were

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The satellite launching center was built in a secret place,around __ high mountains.A which was B it was C which were D them were
The satellite launching center was built in a secret place,around __ high mountains.
A which was B it was C which were D them were

The satellite launching center was built in a secret place,around __ high mountains.A which was B it was C which were D them were
C
这是用了全部倒装语序的定语从句,介词around 前置,指物,只能用which ,这样可排除B,D
由于主语high mountains是复数,故选复数谓语C

C which were
which引导定从修饰place , 定从的主语是high mountains.因此谓动用were不用was.