Question

Make a tentative guess _____ Peking Man _____ have done and used thousands of years ago.

A．that; may

B．that; must

C．what; may

D．what; should

Answer 1

C

考查名词性从句和去运动场。句意“试着猜测一下，几千年前，北京人可能做了什么事，用的什么工具。”guess后跟的宾语从句，从句的done和used缺少宾语，故用what，既然是猜测，应该用may。故选C。