Life ____ be much happier if we ____ only be born at the age of 80 and gradually approach 18.
A．will, canB．will, couldC．would, canD．would, could
D
本題表示的虛擬的意思，與實(shí)際不符，用虛擬結(jié)構(gòu)，主從句的動(dòng)詞都用過去的結(jié)構(gòu)形式，故本題選D。
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