问题
选择题
We don't know ___ to pay a visit to the old town.
A．whether
B．if
C．that
D．which
答案
答案：A
宾语从句中，动词不定式前用whether而不用if。
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We don't know ___ to pay a visit to the old town.
A．whether
B．if
C．that
D．which
答案：A
宾语从句中，动词不定式前用whether而不用if。