Choose the correct participle form. (Present Participle, Past Participle or Perfect Participle)

Câu hỏi

_____ each other for ages, they had a lot to talk about.

A. Not seeing

B. Not having seen

C. Not see

D. Not seen

Đáp án
B. Not having seen

Câu hỏi thuộc Bài tập:

E11- Unit 5- participles