题目内容
I don't know________ they have passed the exam.
| A．what | B．if | C．when | D．where |
B
解析试题分析: 句意：我不知道他们是否通过了考试？此题考查宾语从句if 是否的意思;根据句意，故选B。
考点：考查宾语从句。
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