题目

(2019·全国卷Ⅲ)On our way to the house, it was raining __1__ hard that we couldn't help wondering how long it would take __2__ (get) there. It was in the middle of Pearl City. We were first greeted with the barking by a pack __3__ dogs, seven to be exact. They were well trained by their masters __4__ had great experience with caring for these animals. Our hosts shared many of their experiences and __5__ (recommend) wonderful places to eat, shop, and visit. For breakfast, we were able to eat papaya (木瓜) and other fruits from their trees in the backyard. When they were free from 已知，且，那么sin2α等于（ ）A．B．C．D．