语法
托福语法题汇总(编辑修改稿)
(A) represented (B) do the represent (C) to represent (D) representing 2. Sometimes__________to place physics and chemistry into separate categories. (A) difficult (B) is difficult (C) it is
语法百科全书(编辑修改稿)
town at all? No, this is the first time I ___ here. A. was B. have been C. came D. am ing 答案 B. This is the first time 后面所加从句应为现在完成时，故选 B。 (2) Have you ____ been to our town before? No, it39。 s the