题目内容

With the teacher___________ me, I feel quite at ease.

A. help
B. helped
C. helping
D. being helped

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It was my younger brother who_________ me to Jazz.

A. informed
B. introduced
C. performed
D. assured

The________ city for the 2008 Olympic Games is Beiing.

A. host
B. only
C. master
D. main

Every month the group meets so Its member can ______ their views.

A. change
B. imply
C. find
D. exchange

请用三点法进行估计时，如果乐观估计值为10，悲观估计值为20，最可能估计值为15，则该工作的时间估计结果为（））

A. 25
B. 10
C. 15
D. 20