We missed our train and the next train was delayed we had to wait for another two hour

问题补充：

We missed our train, and the next train was delayed, we had to wait for another two hours.

A. on top of that; so

B. as a result; thus

C. what was worse; therefore

D. apart from that; then

答案：

(答案→)A. on top of that; so

B. as a result; thus

C. what was worse; therefore

D. apart from that; then

解析：句意：我们误了火车，而且更糟的是下一列火车也晚点了。on top of另外；what was worse更糟的是，它是独立使用，所以它的后面必须加上逗号。thus ，so 和therefore后面都可以跟结果。根据句意故选A。