单选题
If the temperature of the reactor _____ 500 degrees higher, meltdown would have occurred.无
A、
was
B、
had been
C、
was being
D、
had
【正确答案】
B
【答案解析】
句意： 如果反应堆的温度再高500度的话，物质就可能会融化。本题考查的是虚拟语气， 由主句would have occurred可知， 该题考查的是与过去相反的虚拟语气， 从句用had done。
提交答案
关闭