Helen________her keys in the office so she had to wait until her husband________home．
| A．has left；comes |
| B．left；had come |
| C．had left；came |
| D．had left；would come |
―Mike, you _______ the magazine since last week. Can you return it now?
―Sure.
A. borrowed B. have borrowed C. have kept
--Mum, I’m leaving for Beijing tomorrow.
--OK! You’d better ring me up you get there.
A. until B. as soon as C. because
A Wechat（微信）is an invention ________can help people talk to friends，share photos，ideas and feelings freely .
A. which B. who C. /
—Is that Kate’s car?
—It ______be hers. She has just gone for a meeting.
A. can’t B. may C. mustn’t
—______will you stay here for the meeting?
—For two days.
A. How long B. How often C. How much