The teacher requested that his students ___touch any of the test tubes in the lab.A.mustn't B.couldn'tC.wouldn't D.shouldn'tB为什不对,请解析,

the students()()()the teacher match the teacher's listen to the teacher! ask the teacher for ask the teacher tor ask the teacher是什么意思 the write and teacher the teacher (名词所有格) please [ ]the teacher I heled the teacher. The teacher taught us___ THE PIANO TEACHER怎么样 The teacher teacher us ____(learn) English. Can’t be done?Please response as we have requeste 求翻译 The teacher _________yesterday afternoon.The teacher _________yesterday afternoon. he is listening to the teacher.对the teacher 提问 how is the teacher?改为同义句( )( ) the teacher ( 英文the new English teacher is in the teacher