It is necessary that the meeting ____ at once.
A: began
B: begin
C: begins
D: will begin
A: began
B: begin
C: begins
D: will begin
举一反三
- Three fourths of the research （） next year. A: begin B: begun C: began D: begins
- The football match _____at seven yesterday evening. A: begin B: begins C: began D: beginning
- ________, you must continue. A: Once you begin B: When you begin C: Once you will begin D: While you begin
- 4. I don’t know _________ to learn English. A: when he begins B: when did he begin C: when does he begin D: when he began
- The concert ____ at 7:30 and ____ at 10:30. A: begin; end B: begins; ends C: began; ended D: begining; ending