we had expected, he was late again. A. WhichB. AsC. WhatD. Since

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A. Which
B. As
C. What
D. Since
解析：本题考查定语从句。结合句意“正如我们所预料的，他又迟到了。”可知，所选之词要代替主句he was late again，故要用as或which，但which在此种用法时，不可用在句首。