We __________ 1000 English words since we __________ to learn English.
| A．learned; begin | B．have learning; began |
| C．have learn; begun | D．have been learning; began |
We __________ 1000 English words since we __________ to learn English.
| A．learned; begin | B．have learning; began |
| C．have learn; begun | D．have been learning; began |
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