It was only when I reread his poems recently ________ to appreciate their beauty．

A.did I begin

B.I began

C.that I began

D.had I begun

答案及解析： C

解析：

和第上题一样，在It is…that引导的强调句结构中，主句无需倒装。这句句子的意思是“只有当最近我再一次读他的诗时，我才开始欣赏到它的美丽。”