miànduì / lǎoshī / de / zhìwèn / tā / qiánkǒujiéshé / yījù / huà / yě / shuō / bùchūlái

面对老师的质问，他钳口结舌，一句话也说不出来。

Faced with the teacher's questioning, he was tongue-tied and couldn't utter a single word.