WE HAVEN'T KEPT IN TOUCH WITH EACH OTHER ……….C. WOULD A. SINCE 6 D...

64. - BAI TAP TRAC NGHIEM TONG HOP A9
BAI TAP TRAC NGHIEM TONG HOP A9

64. We haven't kept in touch with each other

……….

c. would

a. since 6 days b. for 6 days c. 6 days

have to.

ago d. over 6 days