A、 was present
B、 were present
C、 have been presented
D、 has been presented
答案:A
解析:解析:not only... but also 谓语动词与相邻名词一致。present 呈现,介绍
A、 was present
B、 were present
C、 have been presented
D、 has been presented
答案:A
解析:解析:not only... but also 谓语动词与相邻名词一致。present 呈现,介绍
A. Although such a short time
B. It is such a short
C. With so short time
D. With such a short time
解析:解析:C的正确
A. 矛盾的主要方面与次要方面的关系问题
B. 主要矛盾与次要矛盾的关系问题
C. 矛盾的同~性和斗争性的关系问题
D. 矛盾的普遍性和特殊性的关系问题
A.
B.
C.
D.
解析:试题解析:本题考查的知识点为-阶微分方程的求解.可以将方程认作可分离变量方程;也可以将方程认作-阶线性微分方程;还可以仿二阶线性常系数齐次微分方程,并作为特例求解.
A. used to not
B. never used
C. didn't use to
D. didn't use
A. may go
B. should go
C. should have gone
D. must have gone
A. to expect
B. expected
C. expecting
D. to be expecting
解析:解析:it is no use doing
A. require
B. ask
C. encourage
D. permit
解析:解析:stay out 不回家解析:require 要求Ask 要求解析:encourage 鼓励解析:permit 允许
A. as
B. that
C. and
D. but
解析:解析:not so/ as…as
A. has
B. have
C. will
D. would
解析:解析:never before开头,句子倒装。主语so many people为复数。engage in doing sth. 忙于做某事。