B pretend to be doing 是强调不定式的动作正在进行的过程中.pretend to do是强调假装要做某事,而不一定正在进行或者是已经发生.还有一种完成式pretend to have done 强调假装后面的动作已经完成.
We mustn't pretend_____what we don't know.A:know B:to know C
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