Beginner Level 初级 (chūjí)
The correct answer to this test is A.
A. “所以 (suǒyǐ)” means “so” or “therefore” in Chinese. Because “因为 (yīnwèi)” and “所以 (suǒyǐ)” are compound conjunctions, they are conjoined in a sentence. “因为” leads a causative clause, while “所以” heads a clause of the results.
B. “但是 (dànshì)” means “but,” and it is a transitional conjunction. It is often used together with “虽然 (suīrán),” however sometimes “虽然 (suīrán)” can be omitted.
(Suīrán) tā hěn cōngmíng, dànshì bú gòu qínfèn.
（虽然）他 很 聪明， 但是 不 够 勤奋。
He is smart, but not diligent.
C. When “就 (jiù)” is used as a conjunction, it is usually put together with “一” to make a compound conjunction. “一 (yī)… 就 (jiù)…” means “as soon as.”
Wǒ yì chū mén jiù pèngdào Màikè le.
我 一 出 门 就 碰到 麦克 了。
I met Mike as soon as I got out of my house.
D. “才 (cái)” is typically a compound conjunction, meaning “only…” When used in the construction, “只有 (zhíyǒu)…才 (cái)…,” it leads a conditional and results clause. Sometimes “只有 (zhíyǒu)” can be omitted.
Zhíyǒu nǔlì cái yǒu shōuhuò.
（只有）努力才 有 收获。
Only one who works hard may succeed.