50.
Your Answer is
Correct Answer is F
Explanation
According to the meaning of the sentence "Harvard bet that she can pass the test and become a policeman", the two verbs before and after and, could pass and signed, should be in the same form. F is correct.
G item: where guides the attributive clause, and the previous test is not the location adverbial of the latter clause.
Item H: in that "because", there is no causal relationship between the preceding and the following sentences.
Item J: There is no parallel content before and after and.