题文
There are so many kinds of pens in the shop that I can’t decide________．
| A．when to buy |
| B．where to buy |
| C．what to buy |
| D．which to buy |
There are so many kinds of pens in the shop that I can’t decide________．
| A．when to buy |
| B．where to buy |
| C．what to buy |
| D．which to buy |
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