He pretended to be reading a book 中为什么用be reading
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Hepretendedtobereadingabook中为什么用bereadingHepretendedtobereadingabook中为什么用bereadingHepretendedtoberea
He pretended to be reading a book 中为什么用be reading
He pretended to be reading a book 中为什么用be reading
He pretended to be reading a book 中为什么用be reading
to是介词,后接动词原形,所以用be
be reading强调假装看书这个动作正在进行