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定语从句问题1/it is necessary to underline a word or sentence_____

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定语从句问题
1/it is necessary to underline a word or sentence________one has any question
A at which B about which C at where D the place
2/i saw some trees___the leaves were black with holes.
A where B of which C in which Dwhose
3/i'm afraid he won't be able to come_______you suggested last week
A at the time when B at the time that C at the time what D at the time of
a;b;