中文谷Onlywhentheyhadn’theardfromherforalongtime
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問題詳情：
Only when they hadn’t heard from her for a long time ________ to doubt whether something bad had happened to her.
A. they began B. did they begin C. they had begun D. had they begun
【回答】
B
知識點：倒裝與省略
題型：選擇題
標籤：
Onlywhentheyhadn
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