________ in thought, he almost ran into the car in front of him.
A、LosingC
这里分词短语的意义应为“Ashewaslostinthought”，意为“由于陷入沉思”，这儿填入过去分词短语，表示一种状态，用作原因状语。
Thefirsttaskofabrochureisto_______.
Neither English nor Chinese ________ difficult to learn.
A well-known example of the large scale destruction of an ecosystem through vegetation removal to accommodate tourist facilities is the case of the _______.
______ is recognized as the national flag-carrier.
He found _______ difficult to study maths.
