39. _____ carefully in advance, the activity should be very successful.
(A) Planning
(B) If planned
(C) To plan
(D) When planning
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統計: A(735), B(658), C(223), D(53), E(0) #3032512
統計: A(735), B(658), C(223), D(53), E(0) #3032512
詳解 (共 4 筆)
#5675437
由連接詞所引導的副詞子句中,若主詞一致可省略S+be V
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