8. They have studied English before they went to London. A B C 9. They has got married for 30 years by the end of this month. D D A B C 10. Up to now, there had been no woman being chosen the US president. B C A D Exercise 3: Correct the mistake in the following sentences. 1. Why are you so late? I am waiting here for you for more than one hour. A C D B 2. Phuc never go to bed before he has finished his homework.
