A.how, to prevent | B.that, prevents | C. how, preventing | D.why, prevented |
A.believe | B.believing | C.believed | D.to believe |
A.leaving | B.leave | C.left | D.being left |
A.have passed | B.having passed | C.had passed | D.passing |
A.to be | B.be | C.being | D.been |
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