It ______ quite correct that happiness comes from thinking about things in a positive way.
A．has turned outB．has been turned outC．is turning outD．is turned out
A 
考查動詞時態(tài)。turn out這里作連系動詞用，是不及物動詞，故不用進行時態(tài)，也不能用被動語態(tài)。
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