Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (đề 29)

They have been in love with each other they were young

8/40

Mark the letter A, B, C, or D to indicate the correct answer to the following question.

They have been in love with each other ______ they were young.

until

while

since

all are correct.