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
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(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。