One of the things she wrote about ______ life on a small farm at

One of the things she wrote about ______ life on a small farm at the beginning of the century.
A、is
B、was
C、are
D、wereone of
【正确答案】：B
【题目解析】：one of +名词复数,但谓语是单数，看后面she wrote所以用过去式。