【評論主題】My sister and I _________ never ________ to Singapore.(A)have / go(B)has / gone(C)has / been(D)have
【評論內容】因為有not only...but also... 所以有兩個人的話，後面的動詞選離的比較近的主詞，像這題My sister和I，動詞較接近I，所以選have
【評論主題】I tried to________ my son who had just failed an examination, but in vain.(A)encourage (B)occur
【評論內容】in vain徒勞無功vain無益的；白費的
【評論主題】No sooner _______ the department than it began to rain.(A) we had left (B) we left (C) had we lef
【評論內容】no sooner...than