og 261 请教时态问题，大家给看看！
261. Being a LACE>United StatesLACE> citizen since 1988 and born in LACE>CalcuttaLACE> in 1940, author Bharati Mukherjee has lived in LACE>EnglandLACE> and LACE>CanadaLACE>, and first came to the LACE>United StatesLACE> in 1961 to study at the Iowa Writers’ Workshop.
(A) Being a United States citizen since 1988 and born in Calcutta in 1940, author Bharati Mukherjee has
(B) Having been a United States citizen since 1988, she was born in Calcutta in 1940; author Bharati Mukherjee
(C) Born in Calcutta in 1940, author Bharati Mukherjee became a United States citizen in 1988; she has
(D) Being born in Calcutta in 1940 and having been a United States citizen since 1988, author Bharati Mukherjee（C）
(E) Having been born in Calcutta in 1940 and being a United States citizen since 1988, author Bharati Mukherjee
看了og的解释，还是不能理解B的答案为什么错，显然1988年的事发生在1940年之后，而since 1988中用完成时是对的啊。看不出有解释中的歧义（Choice B illogically suggests that upon her birth in 1940, Mukherjee had already been a United States citizen since 1988. ）。C中为什么用has完成时结构？觉得过去时应该更好些。
C is best. The first clause presents its information clearly and in logical sequence. The use of a semicolon to set apart the remaining information further assists the clarity of the sentence. In A, the phrase Being... and born violates parallelism and oddly presents its information in reverse chronological order. In D and E, the use of progressive forms (Being born, having been, Having been born, and being) implies continuous action, a notion that is not appropriate to the facts being presented. Also, these forms do not establish a logical time sequence, suggesting, for example, that Mukherjee had been a United States citizen before she lived in England and Canada and first came to the United States. | 
