he often seems sad.同义句 he often seems ------- ------- sad.it seems ----- he ----- often sad.

he often seems sad.同义句 he often seems ------- ------- sad.it seems ----- he ----- often sad.

题目

he often seems sad.同义句 he often seems ------- ------- sad.it seems ----- he ----- often sad.

答案

to be
that.is

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