In vain ______to open the locked door.
A: he tried to
B: did he try
C: tried he
D: he did try
A: he tried to
B: did he try
C: tried he
D: he did try
举一反三
- I vain _____to open the locked door. A: he tried B: did he try C: he tries D: does he try
- ______, he was unable to make much progress. A: Hard as he try B: Hard as he tried C: As he tried hard D: He tried hard
- , he still can't understand why the universe originated from a big bang. A: As he had tried B: Might he has tried C: Try as he might D: Try as he is
- （）he here, he（）his best to help you. A: Were...would try B: Were...would have tried C: If...would try D: Had been...would have tried
- 17、In vain to get in touch with the Embassy. A: they tried B: tried they C: did they try D: they have tried