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A
write
B
was writing
C
have been writing
D
am writing
正确答案 :C
解析
本题考查句法——动词时态。
句意:你最好不要打扰我,我整个上午都在写信,到目前为止已经写了六封信了。
C项:have been writing 现在完成进行时。根据all the morning和句意可知,此处用现在完成进行时,表示过去的某一动作一直持续到现在,并且可能一直持续下去,结构为“have/ has been + 动词的现在分词”。符合题意,故选C。
A项:write 一般现在时。不符合题意,故排除。
B项:was writing 过去进行时。不符合题意,故排除。
D项:am writing 现在进行时。不符合题意,故排除。
故本题答案为C。
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