A good idea occurred to Mr. Baker________ to his invention recently.
[ ]
A. while applying B. while applied C. while he was applying himself D. while applying himself
参考答案:
At school, some students are active ______ some are shy, yet..
At school, some students are active ______ some are shy, yet they can be good friends with one another.[ ]A. whileB. althoughC. so D. as