单项选择题
Choose between "will be + -ing" and "will have + -ed" t...
问答题Choose between "will be + -ing" and "will have + -ed" to fill in the blank. He spends all his spare time planting trees. He says by the end of next year he _____(plant) 2000.
A、 B、 C、 D、
单项选择题 A、 B、 C、 D、
下述表达式中, 可以正确表示x≤0或x≥1的关系。( )A. (x>=1) | | (x x>...
单项选择题下述表达式中, 可以正确表示x≤0或x≥1的关系。( ) A. (x>=1) | | (x<=0) B. x>=1 | x<=0 C. x>=1 && x<=0 D. (x>=1) && (x<=0)