18. ___ since graduation from high school, Joe had to find jobs to sustain himself.
(A) Having self-supported
(B) Self-supported
(C) Self-supporting
(D) Being self-supported

Self-supporting → 是形容詞

原句：John had been self-supporting since graduation from high school
分詞構句：Having been self-supporting.....
動詞是be V可以省略（請看下圖c.），故得解


附上我問我母語英文的美國朋友，甚至是英文系，他也選錯XD
(朋: I am not wrong though, the test is wrong)
他幫我回覆的解析如下：

The correct answer is (C) Self-supporting.

The phrase "self-supporting" is an adjective that describes Joe's current state of supporting himself since graduation from high school.

Option (A) "Having self-supported" is incorrect because it uses the present perfect tense, which suggests an ongoing action that is not necessarily true in this case.

Option (B) "Self-supported" is grammatically correct, but it is a past tense verb phrase rather than an adjective, which does not fit the context.

Option (D) "Being self-supported" is also incorrect because it uses the present participle form "being" which does not fit the context of the sentence.

是不是應該要是Having been self-supporting 才最正確呢？

應該是Joe has been self-supporting since graduation from high school, so she had to find jobs to sustain herself. 改寫成分詞構句Having been self-supporting since… , Joe had to…

是這樣吧？