— When _______ you _______ to learn to ride your bike？
— I really can’t remember the time.
| A．do; begin | B．did; begin | C．have; begun | D．had; begun |
— When _______ you _______ to learn to ride your bike？
— I really can’t remember the time.
| A．do; begin | B．did; begin | C．have; begun | D．had; begun |
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