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  3. You ______ all morning, but you ______ three letters!

You ______ all morning, but you ______ three letters!

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问题 You ______ all morning, but you ______ three letters!
选项 A、have been typing, have only done
B、were typing, only did
C、had been typing, have only done
D、have typed, have only done
答案A
解析 all morning表示一个时间段，应用现在完成进行时。后半部分强调的是结果，整个上午的时 间里做了多少事。
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