单项选择 适中0.65 引用1 组卷90
Your father has just fallen asleep. Don’t wake him up ________ it’s really necessary.
A.unless | B.or | C.and | D.if |
21-22八年级下·山东东营·期末
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You will never be successful _________ you have a strong will and self-control.
A.and | B.but | C.if | D.unless |
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