试题题干
Word Formations
Complete the following sentence with the proper form of the word in the bracket.
(doubt) Because of a long drought, the farmers are
about the prospect of a good yield.
参考答案
试题解析
此处缺少形容词。
be doubtful about：对...持怀疑态度。 –ful形容词后缀。
句意：由于长期干旱，农民很怀疑是否能够得到好的收成。