Mike is putting on weight. He _____ quite fat.

Mike is putting on weight. He _____ quite fat.
A、is
B、will going to be
C、has been
D、is going to be
【正确答案】：D
【题目解析】：此句的意思是Mike在增重，他会变得很胖。Be going to表示将来，有…的迹象。前面的is putting on weight是现在进行时，所以后面要用一般将来时。