______ did we go swimming in the Changjiang River.A. Only B. Once C. Seldom D. W

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问题 ______ did we go swimming in the Changjiang River.

选项 A. Only
B. Once
C. Seldom
D. When

答案C

解析句首为否定或半否定的词语,如 never,hardly,seldom,scarcely,little,at no time,not only,not once等,句子采用部分 倒装的形式,即将谓语的一部分如助动词或情态动词倒装至主语之前。如果句中的谓语没有助动词或情态动词,则需添加助动词do,does或did,并将其置 于主语之前。
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