______,the boy couldn’t enter his house.
| A．Since the key had lost | B．T he key being lost |
| C．Lost the key | D．Having lost the key |
---I acquired ______ Van Gogh from a businessman from Paris the other day.
---Really? Are you sure it’s ______ real one?
| A．/, a | B．/, the | C．a, a | D．a, the |
The soldiers soon reached ________ was once an old temple ________ the villagers used as a school.
| A．which, where | B．where, which | C．what, which | D．what, where |
After Chang’e-3 landed on the moon on Dec 14, China became the third country _________ this after the US and the former Soviet Union.
| A．having achieved | B．achieving | C．achieved | D．to have achieved |
---Excuse me, has the train from Beijing arrived yet?
--- ________, you are three quarters earlier. It's only 9 now.
| A．Unconsciously | B．Instantly | C．Absolutely | D．Actually |
The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.
| A．unless | B．until | C．since | D．however |