问题
选择题
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
题目分析：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。
点评：本题难度适中。副词和短语是高中阶段的重要的语法项目，需要考生掌握它们的用法、意义及区别。
即学即练：He was late as a result of the snow.
A. on top of B. as a result C. as a result of D. apart from
解析：C。句意：由于大雪他迟到了。