题文
---____ do you study for a math test? ---I study math ____ lots of exercises.
| A．What, by doing | B．How, by doing | C．How, doing | D．What, doing |
---____ do you study for a math test? ---I study math ____ lots of exercises.
| A．What, by doing | B．How, by doing | C．How, doing | D．What, doing |
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