脸上有黑斑是怎么回事:the pressure___causes Americans to be energetic

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the pressure___causes Americans to be energetic,but it also put them under a constant emotional strain
a.to compete
b.competing
c.to be competed
d.having competed

选哪个?为什么?

A.

the pressure to do something

a.to compete

竞争的压力……

the more...the more the heart of the matter - the eagles the librarian The Replacements the oc!!!!! The Czars the sims2~~ The TRAX the rose.. ！THE END