单选题 There is no doubt ______ you will pass the exam this time. You have worked so hard in the past months.
A．whether B．that C．if D．what

【正确答案】 B
【答案解析】[解析] 宾语从句，引导词用that。由于主句是否定句，所以引导词用that。若doubt用于肯定句，则可用whether，if。