Mark the letter A,B,C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
They were suspected to have robbed the bank. The police have investigated them for days.
A. Suspected to have robbed the bank, they have been investigated for days
B. Suspecting to have robbed the bank, they have been investigated for days.
C. Having suspected to have robbed the bank, they have been investigated for days.
D. They have investigated for days, suspected to have robbed the bank.