英语高手请进！
ifeltsoembarrassedthaticouldn'tdoanythingbut____therewhenifirstmetmypresentboss.这个地方给...
i felt so embarrassed that i couldn't do anything but____ there when i first met my present boss.这个地方给的答案是sat，为什么不用sit或sitting呢．帮忙解答一下！
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