—Why are you looking so worried? —I sent an email to my son in America last week but no r

问题补充：

—Why are you looking so worried?

—I sent an email to my son in America last week, but no reply .

A. was received

B. had received

C. has received

D. has been received

答案：

A. was received

B. had received

C. has received

(答案→)D. has been received

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