No sooner _________ he sat down to read the newspaper _________ the bell rang.
| A．do; when | B．did ； than |
| C．had ； then | D．had ； than |
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No sooner _________ he sat down to read the newspaper _________ the bell rang.
| A．do; when | B．did ； than |
| C．had ； then | D．had ； than |
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