问题描述：
一道英语宾语从句的题目,说明理由.
1.Does your teacher know ______?
A.when he has come B.why he didn't come
C.if he comes tomorrow D.whom he is looking
1.Does your teacher know ______?
A.when he has come B.why he didn't come
C.if he comes tomorrow D.whom he is looking
问题解答：
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