题文
To improve the quality of our products, we asked for suggestions __________ had used the products.
| A．whoever |
| B．who |
| C．whichever |
| D．which |
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To improve the quality of our products, we asked for suggestions __________ had used the products.
| A．whoever |
| B．who |
| C．whichever |
| D．which |
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