She cannot answer this question at once， but can find the answer to it from that book.A.e

This question admits______several answers. （1992年考试真题）A．forB．withC．ofD．to

What is the true definition of a gentleman？ This question is not easy to answer completely

He cannot answer this question at once bu

She cannot answer this question【 at once】 but can

He cannot answer this question 【at once】 but can

The answer this question is known ________ us all