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The boy was playing under the tree ________ the accident happened.
A.whenB.soC.whileD.if
20-21八年级上·江苏·期末
知识点:so(这样 pron.)过去进行时含when、while延续性动词与非延续性动词从属连词辨析 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!