摘要： I had been puzzled over the problem for over an hour without any result, all at once the solution flashed across my mind. A. while B. when C. then D. as
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I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.
A. while B. when C. then D. as
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I had been puzzled over the problem for over an hour without any result, all at once a solution flashed across my mind.
- A.while
- B.when
- C.then
- D.as
.I had been puzzled over the problem for over an hour without any result, _____ all at once thesolution flashed across my mind.
A.while B.when C.then D.as
查看习题详情和答案>>