39. Let’s learn to use the problem we are facing _______ a stepping-stone to future success.
| A．to | B．for | C．as | D．By |
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21. Every minute should he made full use of_______our lessons. ?
| A．studying | B．to study | C．study | D．being studied? |
20. His sister left home in 1998, and______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
19. He has made a lot of films, but___________good ones..
| A．any | B．some | C．few | D．Many |
18. I can' t leave. She told me, that I_____stay here until, she comes back.
| A．can | B．must | C．will | D．May |
. is it B. is there C. am. they D. are those相关知识点
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