I was so young.  You__________ better than to rely on me
A．should have knownB．should knowC．must knowD．must have known
A
考察虛擬語氣。句意：我是如此年輕。你應(yīng)該知道最好不要依賴我�！皊hould+have+done”意思是“本來應(yīng)該做某事，而實(shí)際沒做。故選A。
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