校车和2011(2012)年9月1日起出厂的公路客车、旅游客车的前风窗玻璃以及外玻璃用于驾驶人视区部位的可见光透射比应大于70%,其他车窗玻璃的可见光透射比不小于50%()
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__________ the convenience of digital payment, many senior citizens started to use smart phones.
A. To enjoy
B. Enjoying
C. To have enjoyed
D. Enjoy
A few months after he had arrived in China, Mr. Smith ___________ in love with the people and culture there.
A. would fall
B. had fallen
C. has fallen
D. fell
China's image is improving steadily, with more countries__________ its role in international affairs.
A. recognizing
B. being recognized
C. to be recognized
D. recognized
What a pity! You missed the sightseeing, or we _________a good time together.
A. had
B. will have
C. would have had
D. had had