If only I ______ to ski then.
(A)learn
(B)learning
(C)have learned
(D)had learned

答案：登入後查看
統計： A(29), B(27), C(61), D(109), E(0) #244846

詳解 (共 1 筆)

#303106
If onl +主詞 +had p.p +現在時間(與過去相反)

from: http://www1.hipass.com.tw/explain/s_english_chi_san/pdf/v3aeh050004-0.pdf
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