The moment John will never forget is ______ Mr. Smith gave him a lot of valuable advice on how to improve his writing.
| A．that; that | B．that； when |
| C．when; that | D．when; when |
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The moment John will never forget is ______ Mr. Smith gave him a lot of valuable advice on how to improve his writing.
| A．that; that | B．that； when |
| C．when; that | D．when; when |
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