--Hi,Tracy,what are your parents doing?--They___the living room the whole morning--Hi,Tracy,what are your parents doing?--They___the living room the whole morning.A.will paint B.had painted C.have been painting D.was paintig

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--Hi,Tracy,what are your parents doing?--They___the living room the whole morning--Hi,Tracy,what are your parents doing?--They___the living room the whole morning.A.will paint B.had painted C.have been painting D.was paintig
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--Hi,Tracy,what are your parents doing?--They___the living room the whole morning--Hi,Tracy,what are your parents doing?--They___the living room the whole morning.A.will paint B.had painted C.have been painting D.was paintig
--Hi,Tracy,what are your parents doing?--They___the living room the whole morning
--Hi,Tracy,what are your parents doing?
--They___the living room the whole morning.
A.will paint B.had painted
C.have been painting D.was paintig

--Hi,Tracy,what are your parents doing?--They___the living room the whole morning--Hi,Tracy,what are your parents doing?--They___the living room the whole morning.A.will paint B.had painted C.have been painting D.was paintig
C 现在完成进行时,表示 动作从过去持续到现在,仍然在进行,或刚刚停止

C.他们整个早上一直在粉刷起居室。

C.have been painting