It's sometimes difficult to see the difference between a fad and a trend
                    举一反三
- The difference between a fad and a trend is that ________.
 - () to (), sometimes it is very difficult () the difference between A: B B: technical English (fromeverydayEnglish).<br/>D
 - Did you see the ______ between the twin sisters? A: different B: difference C: Difficult D: Difficulty
 - (As is known) to all, sometimes it is very (difficult) to (tell) the difference between technical English (from) everyday English. A: As is known B: difficult C: tell D: from
 - It is sometimes difficult to tell the difference ______ the infinitive, the participle and the gerund.
 
