Make a tentative guess _____ Peking Man _____ have done and used thousands of years ago.
A．that; mayB．that; mustC．what; mayD．what; should
C
考查名詞性從句和去運動場。句意“試著猜測一下，幾千年前，北京人可能做了什么事，用的什么工具�！眊uess后跟的賓語從句，從句的done和used缺少賓語，故用what，既然是猜測，應(yīng)該用may。故選C。
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