—_____ you _____ your homework yet?—Yes, I _____ it ten minutes ago.
---Mum,_______ I watch TV? ---No. Unless your homework _______________.
__________terrible luck he had yesterday!
Yesterday I met Jim. We ____________ each other since we _________ middle school.
---When did you return to China?---_________________.
The plane ____________when I got to the airport. I nearly missed it.A. was leaving B. had left C has left D. will leave