问题补充:
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
答案:
A. that; may
B. that; must
(答案→)C. what; may
D. what; should
解析: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。