完成式

His studies of ice-polished rocks in his Alpine homeland, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets had existed in now currently temperate areas.

我记得很多老师讲过去完成式的时候说这个时态用在一个过去的事情发生在另一个过去的事情以前的时候用，按照此理容易选A 因为

Rose flower language is perfect in every way and invulnerable!

10朵玫瑰花语言是完成式在每个方法中和不会受伤害的！

A safe haven from the dangers of elephants and buffaloes on the forest floor, it is the perfect base to go in search of the little known monkey, the red-capped mangabey.

一保险箱港口从象的危险和水牛在那之上森林地板，它是完成式基础去追求那一点点已知的猴子，那红色-加帽于 mangabey。

One of the most fascinating arguments for the existence of an all-perfect God is the ontological argument.

为一个所有完成式上帝的存在的最迷人的争论之一是本体论的争论。

This single word itself is a perfect passive verb.

这是一个过去完成式的动词。

E. 5 morphemes: plural, past, perfective, progressive, present.

大肠杆菌5语素：复数，过去完成式，进步，目前。

D. 4 morphemes: plural, progressive, past, perfective.

d。 4语素：复数，进步，过去完成式。

C. 5 morphemes: possessive, past, superlative, perfective, present.

角5语素：占有欲，过去，最高级，完成式，现在。

When we use the present perfect, there is a connection with now.

当我们使用现在完成式时，是和现在有关联的。

Do not use the present perfect if the situation now is different.

不使用现在完成式当现在的情况是不一样时。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。