https://gmatclub.com/forum/gusty-westerly-winds-will-continue-to-usher-in-a-seasonably-cool-air-m-242543.html

build作不及物动词时，（压力、速度、声音或激情）逐渐变大，逐渐增强 If pressure, speed, sound, or excitement builds, it gradually becomes greater.

usher及物动词
固定搭配：usher (sth) in : 引领，开启；迎来；引入
e.g. A unique opportunity to usher in a new era of stability in Europe

with milky sap 是插入语，“一种草本植物，且是带有milky sap的那种”

C就不是一个完整的句子吧？

mark 在语法上，通常只有感官动词才允许在宾语的补足语中用分词短语，例如：I see a man standing outside.
显然地，show不是感官动词，不允许宾补部分用ing短语。

失误

their compliance with laws+requiring =requiring修饰laws 表示法律要求
their compliance with laws+to require=表示法律的目的

（Often visible as smog,） ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, （two major pollutants emitted by automobiles）, react with sunlight
A from介词后面不能跟句子，只能+名词

D SVO,doing 表因果

老板说“我这么做很safe啦，你怎么看哪”，A回答“如果safe，就会blabla..."，完全不在一个线上，老板是想问你到底这么做safe不safe，根本聊不下去。

D无关

"employee illnesses had increased"不等同于“employees more frequently went to the doctor ”。

求解，为什么不选A？

A COMMA + with modifier must serve to express HOW the preceding action is facilitated.

D: Here, the COMMA + with modifier in red does NOT express how the preceding action -- that the wolves HAVE DECLINED in number -- is facilitated.
Where the wolves are now found did not facilitate their decline but is the RESULT of their decline.

it takes a particle to tunnel through a barrier increases with the thickness of the barrier until tunneling time reaches a maximum; beyond that maximum, tunneling time stays the same regardless of barrier thickness. This would imply that once maximum tunneling time is reached, tunneling speed will increase without limit as barrier thickness increases.

这道题是嵌入式关系分句结构吗？spending引导伴随状语就近修饰see?

“identical, on average”不等同于"always remains constant"

USHER：to take or show sb where they should go。及物动词，排除ABC