6. --- We had to _________very early this morning at the airport.
A: A. check in
B: B. check
C: C. checked in
D: D. checked
A: A. check in
B: B. check
C: C. checked in
D: D. checked
举一反三
- There is something wrong with my TV set. I must have it ___________. A. check B. checking C. to check D. checked A: A B: B C: C D: D
- ______ the instruction carefully, the mistakes can be avoided. A: Having checked B: B. Check C: If you check D: D. To check
- He has just ______________ at the hotel. A: check in B: checked in C: check on D: checked on
- What did John and Paul do early in the morning? A: Come to Lowis. B: Check in at the airport. C: Check in at the hotel.
- The car often breaks down and we must have it () thoroughly. A: check B: checked C: to check D: checking