EXERCISE 3I. CHỌN TỪ/ CỤM TỪ THÍCH HỢP (ỨNG VỚI A, B, C, D) ĐỂ HỊAN TH...

4. - BAI TAP ON THI TN VA DAP AN
BAI TAP ON THI TN VA DAP AN
4.  If he had known my phone number, he would have phoned me.