Question

4. It was quite right for Yuan Longping to think that the key people was to have more rice and to produce it more quickly.

   A. to feeding   B. to feed

   C. of feeding   D. of feed

Answer 1

4. A

4. A解析：the key to…意为“……的关 键”，该结构中to是介词，后跟名词、代 词或动名词。