He thing there will be --building in the future（A more tall

1.B
他想,未来会有更多的更高的建筑物.用比较级.tall的比较级形式是taller,much可以修饰形容词的比较级.因此选B
2.A
从next week 判断是将来时,be going to do 表示将来 will do 也是表示将来.但不可以一起用哦.
3.是因为,maybe是副词,意思是“也许、可能”,在句中作状语,相当于perhaps,常位于句首.
Maybe she’ll come this afternoon.她可能今天下午来.
Maybe you put the letter in your pockets.大概你把信放在衣袋里了.