He was late for the meeting because the bus he took ______ halfway.
| A．broke in | B．broke down | C．broke out | D．broke up |
相关试题
（北京卷30）. 
they decide which college to go to, students should research the admission procedures.
| A．As | B．While | C．Until | D．Once |
（安徽卷33）. Just use this room for the time being, and we’ll offer you a larger one ____it becomes available.
| A．as soon as | B．unless | C．as far as | D．until |
（安徽卷29）. The engineer are so busy that they have zero time for outdoor sports activities, ___they have the interest.
| A．wherever | B．Whenever | C．even if | D．as if |
（全国卷II 7）. Tom was about to close the windows_____ his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
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