题文
--- Do you learn math ___ asking the teacher ___ help?
---- Oh， yes. It helps a lot.
| A．by； for | B．for； by |
| C．by； to | D．to； by |
--- Do you learn math ___ asking the teacher ___ help?
---- Oh， yes. It helps a lot.
| A．by； for | B．for； by |
| C．by； to | D．to； by |
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