必修3 unit 1 the world of our senses ⅰ.单项填空 1．—is there any news for the missing boy? —yes，he was observed ________computer games at eight o'clock yesterday in a net bar. a．play b．played c．to play d．playing 答案 d [根据时间状语及句意可知，应选择一个表示动作正在进行的选项作主语补足语，故d项符合题意。] 2．________by the teacher，tom got into the classroom from the back door quietly. a. to avoid being seen b. avoiding seen
