The students want to know ____ 1,600 words in a month.
| A．how can they remember | B．how they can remember |
| C．when could they remember | D．when they could remember |
The students want to know ____ 1,600 words in a month.
| A．how can they remember | B．how they can remember |
| C．when could they remember | D．when they could remember |
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