— When ________ America __________ by Columbus?
— In 1492.
| A．is, discovered. | B．was, discovered. |
| C．was, discovering. | D．was, discover. |
— When ________ America __________ by Columbus?
— In 1492.
| A．is, discovered. | B．was, discovered. |
| C．was, discovering. | D．was, discover. |
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