—What has made him upset recently?
—____alone to face a troublesome milk case.
| A．Left | B．Being left |
| C．Having left | D．To leave |
Traditionally, college students hold a graduation ceremony to encourage themselves before they on their life journey.
| A．give up | B．settle down |
| C．get through | D．set off |
If we a table earlier, we couldn’t be standing here in a queue.
| A．have booked | B．had booked |
| C．book | D．booked |
Tom in the library every night over the last three months.
| A．works | B．worked |
| C．has been working | D．had been working |
My English teacher, as well as her students, ____ to perform at the party last night.
| A．were invited | B．was invited |
| C．have been invited | D．has been invited |
__________ something unexpected happens，I will meet you at the school gate tomorrow
morning.
| A．When | B．Unless | C．Since | D．If |