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

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

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

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