SO FAR HE HAS LEARNT UNIT 5 OF THE BOOK .A. AS LONG AS B. AS LONG...

1. - TRAC NGHIEM TIENG ANH POTX
TRAC NGHIEM TIENG ANH POTX

1. So far he has learnt unit 5 of the book .

a. as long as b. as long as possible c. meanwhile d. up to now