________ kinder to his employees, his business would not have collapsed. A. Mr. Chan had been B. Had if Mr. Chan been C. Had Mr. Chan been D. If had Mr. Chan been21/50________ kinder to his employees, his business would not have collapsed. Mr. Chan had been Had if Mr. Chan been Had Mr. Chan beenIf had Mr. Chan beenGiải thíchChọn đáp án C