The letters I receive from my classmates in America ________ me think that it is a wonderful place to live in.
A. had made
B. make
C. makes
D. made
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Anything ________ should be returned to the owner.
A. borrow
B. borrowed
C. borrowing
D. to borrow
Mary was one of the brightest students who ________ from New York University.
A. is graduated
B. has graduated
C. graduated
D. are graduated
The students in the classroom ________ not to make such a big fuss.
A. need
B. must
C. dare
D. ought
死锁的直接原因是什么?
A. 资源竞争
B. 资源不足
C. 进程互斥
D. 进程推进顺序不合法