单选题 Professional chefs recommend organic flour because, ______ it is somewhat more expensive, it makes food taste so much better.

A、 while
B、 instead
C、 either
D、 still

【正确答案】 A

【答案解析】[解析] 语法：连词
1．because后有两句话，because做连词引导it makes...better，同时做if is...expensive的插入语。
2．空格后有主语it和动词is，因此应填入一个连词。
3．more expensive和food taste so much better在内容上形成对照，因此应使用连词while。