真题练习

963.Before a problem can be solved, it must be obvious ____ the problem itself is.

A.what
B.that
C.which
D.why

964.When the news came ______ the war broke out, he decided to serve in the army.

A.since
B.which
C.that
D.because

答案解析

963.答案是A;常见句型:It is obvious that…其中it为形式主语，后接主语从句。但此处从句中缺少成分，故选what而不能选that，充当从句中的表语。
964.答案是C;that引导同位语从句，说明news的具体内容。