----Goldfish don’t know __________ to them three seconds ago.
----Really? It’s so amazing!
| A．what is happening | B．what to happen |
| C．what will happen | D．what happened |
----Goldfish don’t know __________ to them three seconds ago.
----Really? It’s so amazing!
| A．what is happening | B．what to happen |
| C．what will happen | D．what happened |
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