He knows better than _____(do) such a silly thing.说明一下为啥么.
问题描述：
He knows better than _____(do) such a silly thing.
说明一下为啥么.
答
to do
know better than to ...
答
填to do
这是固定句型，know better than to do/ that 是明事理而不至于做某事的意思。
句子意思是：他明白事理不会做这样的蠢事的。
答
better than doing.
固定短语，better than doing. 不应该会的意思。
答
does
答
to do
know better than+ to do 有头脑,懂道理；不至于蠢到…,不会上当