题目内容
--- What happened to Paul?
--- He was crossing the street ________ a motorbike hit him from behind.
- A.while
- B.when
- C.until
- D.because
B
when在这里是“正当此时”的意思。
when在这里是“正当此时”的意思。
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题目内容
--- What happened to Paul?
--- He was crossing the street ________ a motorbike hit him from behind.