Mary ________ as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
| A．has served | B．had served |
| C．is serving | D．served |
— Why do you look so worried?
— My MacBook Pro broke down and my paper ______ unfinished since.
| A．has been left | B．has left | C．left | D．had been left |
Two years ago, three scientists traveled to the Antarctica to explore a secret world hidden _________ the ice.
| A．among | B．beneath | C．beyond | D．opposite |
I felt surprised that anyone of his intelligence such an easy test.
| A．might have failed | B．could have failed |
| C．should have failed | D．must have failed |
I was feeling left out in the new school ________Alice, an easygoing girl from Canada, came to stay with me.
| A．if | B．once | C．when | D．unless |
【原创】According to its website, each tattoo lasts around seven days, ________ it isn't scrubbed or picked at.
| A．having provided | B．provided that |
| C．providing that | D．being provided |