题文
When the cooking class changed to Thursday, I had to so that I could pick up my son from his piano lesson.
| A．drop in |
| B．drop off |
| C．drop out |
| D．drop by |
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When the cooking class changed to Thursday, I had to so that I could pick up my son from his piano lesson.
| A．drop in |
| B．drop off |
| C．drop out |
| D．drop by |
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