单选题
You ______ all morning, but you ______ three letters!
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
【正确答案】
A
【答案解析】
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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