[原始] 求问gmatprep一题

On the number line, if the numberk is to the left of the number t, is the product kt to the right of t ?

(1) t < 0
(2) k < 1

Statement (1) ALONE is sufficient, butstatement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, butstatement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOTsufficient.

为什么条件2不能单独用来判断命题呢？

K小于1，意味着t大于等于1，

如果k大于0小于1，kt小于t，谓语t左边

如果k为0， kt=0，位于t左边

如果k小于0， kt<0， 位于t左边

总的来说kt不会位于t右边，因此条件2可以用来判断命题，应该选C，但答案选择A，不解