问题描述:
用所给词的适当形式填空.1.—May I go out now,Dad?—No.You must___(let) your mother know first.
2.He is active in ___(sing) in the competition.
3.They left without ___(say) goodbye.
2.He is active in ___(sing) in the competition.
3.They left without ___(say) goodbye.
问题解答:
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