Believe it or not no bread eaten by us is so sweet as earned by our own labour. A. oneB.

问题补充：

Believe it or not, no bread eaten by us is so sweet as earned by our own labour.

A. one

B. that

C. such

D. what

答案：

A. one

(答案→)B. that

C. such

D. what

解析：句意：信不信由你，没有任何面包能比得上我们亲自劳动挣来的(果实)吃起来甜。that＝the＋不可数名词，相当于the bread。选B.