语法与词汇19.____to unplugging the alarm clock and trusting your ability to wake on time on your own, you should probably ease yourself into the new arrangement by keeping a very regular schedule for several weeks. (2016-28)
【正确答案】
B
【答案解析】四个选项均可以和to搭配。prior to表示“在……之前，先于”，如：three weeks prior to the summit峰会前的三周。due to和thanks to都表示“因为，由于”；而be related to则表示“和……有关”。