The students ______ busily when Miss Brown went to get a book she ______ in the office.选项: a、had written … left b、were writing … has left c、had written … had left d、were writing … had left选什么为什么?

Do the students welcome Miss Johnson?（改为被动）_____ Miss Johnson ______ ______ the students? The students are doing to help the old men.(就划线部分提问) The students是划了线.______ ______ ______ ______ ______ the old men? The students are seeing a film now.（用tomorrow代替now)The students _____ ______ ______ ______ tomorrow When the teacher came in ,the students stopped ______(talk ) Look!The students are ______ the teacher carefully.(listen) The students are listening to the ______(report). The students will work in the supermarket画线supermarket提问______ _______ the students ________? the students clean the classroom every daythe classroom ______ _______ ______the students every day some of the students are playing baketball,______ students are playing footbother or the other why? All the students are ______(反对)my plan except Tom. All the students are talking about theirPets ______(noise) There are some students in the classroom,______反义疑问句 Mr Zhang _____ ______ to write down the students' names the students ______[not play] at that time yesterday. the students ______ at their teacher该填什么? The exchange students ______ our school this afternoon. ______(develop)healthy eating habits is important to the students The teather looks happy at his students.（改错）______