A. He could be elected president last month by them
B. He had been elected president last month by them
C. He is elected president last month by them
D. He was elect president last month by them
Explanation
Active sentences in the simple past tense have the following structure: Subject + past tense form of the verb + object Passive sentences in the simple past tense have the following structure: Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence
The National Assembly constituencies, where bye-election has been announced, include NA-22 Mardan, NA-24 Charsadda, NA-31 Peshawar, NA-45 Kurram, NA-108 Faislabad, NA-118 Nankana Sahib, NA-237 Malir, NA-239 Korangi Karachi and NA-246 Karachi South.