Before leaving the dinner table,............your son.............ask permission ( have to ) We.............( not see ) each other for a long tim Whlie i..............( watch ) the peformance, i met one of my friends

2 câu trả lời

Before leaving the dinner table, your son has to ask permission. We haven't seen each other for a long time. Whlie i was watching the peformance, i met one of my friends

1 . has to 

2. haven't seen (hiện tại hoàn thành )

3. was watching (quá khứ tiếp diễn )

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