1037.Thanks to the application of new farming methods, output is now six times _____ it was before 2009.
A.that
B.what
C.which
D.how
1038.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
1037.答案是B;此题表语从句中缺少表语，用what表示2009年以前的情况。
1038.答案是C;what引导宾语从句。句意:请作出一个推测:数千年前北京猿人可能做过什么又使用过什么。tentative试验性的，推测的。
