Although James Cook　　　the first westerner to have discovered Australia,New Zealand and Hawaii,his travels led to the creation of more accurate and reliable maps for vast parts of the world.
A．isn’tB．wasn’t
C．must have beenD．may not have been
D
從to have discovered及 led 可知此處表過去，從句意上看應(yīng)為“過去可能不是”，故選D。
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