I didn’t know this years ago but recent science that inharmonic marital(婚姻的) life like qu

问题补充：

I didn’t know this years ago ,but recent science that inharmonic marital(婚姻的) life like quarrels or fights harms one’ heart.

A. showed

B. is showing

C. has shown

D. shows

答案：

A. showed

B. is showing

(答案→)C. has shown

D. shows

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