_____ in thought , he almost ran into the car in front of him .
| A．Losing | B．Having lost | C．Lost | D．To |
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My parents have promised to come to see me before Ifor Africa.
| A． | have left | B． | leave | C． | left | D． | will leave |
It just isn’t fair_____ I was working as a waiter last month; my friends were lying on the beach. . 
A whenever B. though C. for D. while
The traffic is heavy this day, I _____ arrive a bit late, so could you save me a place? 
| A．can | B．must | C．need. | D．might |
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