Never before _____ in an earnest attempt to resolve their differences.
A. have the leaders of these two countries meet
B. did the leaders of these two countries met
C. have the leaders of these two countries met
D. the leaders of these two countries have met
Đáp án C
Laura and Mitchell are talking about online learning.
- Laura: "Online learning seems the best solution now."
- Mitchell: "_____. It helps students keep learning while schools are closed."
Ben is talking to a waiter in a restaurant.
- Ben: "Can I have the menu, please?"
- Waiter: "_____"
The team’s continued involvement in the competition is uncertain.
Our trip to Swiss Alps had to be put out twice because of bad weather