摘要：if/whether; was; that day.本题考查直接引语是一般疑问句时变间接引语的引导词为 if/whether;时态做相应的变化.即一般过去时.时间状语today变为that day.
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选择括号内恰当的单词或词组填入空白处，使句意完整、正确。（5分）
【小题1】Are you going to （join / take part in）the school rowing club?
【小题2】I think the computer is （used / useful）.
【小题3】I spent two hours （sweep / sweeping）the house yesterday.
【小题4】The house is so expensive that I can’t （share / afford）it.
【小题5】Even scientists aren’t sure （if / whether）or not there are UFOs.
I don’t know he will come tomorrow, he comes, I will tell you.
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A．if; whether |
B．whether; whether |
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C．whether; if |
D．that, whether |
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I don’t know _____ or not he will come . _______ he comes , I will call you .
| A．whether ; If | B．whether ; Whether | C．if ; If | D．if ; Whether |