【单选题】【消耗次数：1】
Where is my pen? I________it.
①
might lose
②
would have lost
③
should have lost
④
must have lost
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【单选题】
I have lost my white hat. I______ it somewhere.
①
must be dropping
②
must have dropped
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【单选题】
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①
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①
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③
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【单选题】
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①
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②
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③
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【单选题】
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①
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②
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③
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①
had they been done
②
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③
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④
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【单选题】
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①
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②
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③
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【单选题】
13. Where is my pen? I ______ it.
①
might lose
②
would have lost
③
should have lost
④
must have lost
【单选题】
This book has been in the works so long that I have lost _____of most of the sources found for me by the staff of the library.
①
trace
②
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③
track
④
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