单项选择 较易0.85 引用1 组卷84
He doesn’t know _________ to stay here or not.
| A．if | B．weather | C．whether | D．that |
15-16九年级上·江苏无锡·阶段练习
知识点：if (是否)thatweatherwhetherwhether or notwhether...or not引导让步状语从句 答案解析 【答案】很抱歉，登录后才可免费查看答案和解析！ 立即登录
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See _________ your invention works as it is planed. If not, do more research, redesign it.
| A．since | B．after | C．until | D．if |
Mike has no time to buy a gift for Alice. So he doesn’t know _________her birthday party.
| A．whether to take part in | B．if to take part in |
| C．whether to join | D．if to join |
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