It was a keen disappointment when I had to postpone the visit wh

It was a keen disappointment when I had to postpone the visit which I had intended to pay to America in February.
A、我原来计划今年二月访问美国，后来不得不推迟，这使我感到很扫兴。
B、我原来计划今年二月访问美国，我感到很扫兴，这使得后来不得不推迟。
C、我原来计划今年二月访问美国，由于很扫兴后来不得不推迟。
D、我原来计划今年二月访问美国这使我感到很扫兴，后来不得不推迟。
【正确答案】：A
【题目解析】：p138