Water，which seems so simple and common，is________makes life possible.
A．what　　　B．that
C．which　　　D．how
A
考查表語從句。What makes life possible是表語從句，what在句中做主語，并引導(dǎo)起這個(gè)從句。BD不能做主語，C特指那一個(gè)。句意：似乎如此常見的水正是讓生命可能的事物。
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