________ HE COMES IN HALF AN HOUR, I SHALL GO ALONE.A. UNLESS B....

13. - DAP AN DE THI THU TOT NGHIEP 2011
Tiếng Anh DAP AN DE THI THU TOT NGHIEP 2011

13. ________ he comes in half an hour, I shall go alone.

A. Unless B. Because C. If D. When