Not until a monkey is several years old _________ to exhibit signs of independence from its mother.
A: it does begin
B: when it begins
C: does it begin
D: efore it begins
A: it does begin
B: when it begins
C: does it begin
D: efore it begins
举一反三
- Not until a monkey is several years old ________ to exhibit signs of independence from its mother. A: it begin B: does it begin C: and begin D: beginning
- Not until a baby kangaroo is four months old ______ to live outside its mother's pouch. A: it begins B: he begins C: is he beginning D: does it 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
- It is necessary that the meeting ____ at once. A: began B: begin C: begins D: will begin
- 2. When does the holiday begin?