How did it______ that humans speak so many different languages?
| A．come out | B．come off | C．come about | D．come round |
The moment I got back to the classroom, I found I _______ my jacket on the playground.
| A．left | B．had left |
| C．have left | D．was leaving |
— Pity you missed the lecture on nuclear pollution.
— I ______ it, but I was busy preparing for a job interview.
| A．attended | B．had attended |
| C．would attend | D．would have attended |
His stepmother is kind to him, ______ whom she has a deep love.
| A．with | B．at | C．of | D．about |
The naughty boy was muddy because he _______ soccer in the rain all afternoon.
| A．has been playing | B．had played |
| C．had been playing | D．was playing |
Finishing their shopping at the mall, the couple discovered that their new car _______.
| A．had stolen | B．had been stolen |
| C．was stolen | D．is stolen |