I am glad that they work much______(hard)than they______(do)before

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I am glad that they work much______(hard)than they______(do)before

I am glad that they work much______(hard)than they______(do)before
I am glad that they work much______(hard)than they______(do)before

I am glad that they work much______(hard)than they______(do)before
harder did

出现than, 副词hard需要用比较级形式harder
出现before,需用过去式did