He said that not until the heavy snow blocked the express _________ how serious the weather was.
| A．did the tourists realize | B．the tourists realized |
| C．the tourists did realize | D．didn’t the tourists realize |
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He said that not until the heavy snow blocked the express _________ how serious the weather was.
| A．did the tourists realize | B．the tourists realized |
| C．the tourists did realize | D．didn’t the tourists realize |
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