Who saw it ______ at that time?
A．happenB．happenedC．happensD．to happen
A

試題分析：句意：那個(gè)時(shí)候誰看見這件事情發(fā)生了？saw 原形為see,看見，其句型是see sb./sth. do sth.，由此句型可知，在see 的結(jié)構(gòu)中應(yīng)該使用動(dòng)詞的原形，故選A。
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