We don"t know ___ to pay a visit to the old town.A．whetherB．ifC．thatD．which
题型：不详难度：来源：
We don"t know ___ to pay a visit to the old town.| A．whether | B．if | C．that | D．which |
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答案
| A |
解析
| 宾语从句中，动词不定式前用whether而不用if。 |
举一反三
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