它是那么有趣的一個節(jié)目以至于人們都笑個不停 。
laugh大笑,to laugh是動詞不定式;laughing是laugh的動名詞形式;
so/such...that....如此...以至于.... ,
so +形容詞+a/an+單數(shù)可數(shù)名詞+that+從句;
such a/an+形容詞+單數(shù)可數(shù)名詞+that+從句。
故第一空用such;
can't/couldn't stop doing sth.不能停止做某事,固定短語,故此處應(yīng)用laughing,故選C。