Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
| A．to cover | B．to be covered |
| C．to have covered | D．to have been covered |
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Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
| A．to cover | B．to be covered |
| C．to have covered | D．to have been covered |
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