So difficult ______ it to adapt to the academic requirements of a Western university that I determined to take a preparation course.
A.I have felt
B.have I felt
C.did I feel
D.I did feel
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C解析本题考查倒装结构。本题考查so + adj + 主谓倒装结构。根据语境时态用一般过去时。句意：很难适应西方大学的学术要求，我决心选一门预备课程。