多选题
Although many of the students had found the assignment ______, Harrison completed it with ease.
【正确答案】
B、D
【答案解析】[解析] ●Although说明前后反义重复。
●空格与with ease(轻易地)反义重复。
●frivolous不重要的，laborious费力的，gratifying令人高兴的，arduous费力的，agreeable令人愉悦的，timely恰到好处的。答案选BD。
●注：这里gratifying和agreeable是干扰项，同表示“令人高兴的”。