单选题
＝（ ）．
A
0
B
－1
C
1
D
2
单选题
若
，则
＝（ ）．
A
1
B
－1
C
0
D
2
单选题
I am very happy to declare that this year’s sales target ______ ahead of time.
A
achieved
B
has achieved
C
has been achieved
D
had been achieved
单选题
By the time you come to see me next month, I ______ my term paper.
A
have completed
B
complete
C
am completing
D
will have completed
单选题
He did not go to school yesterday because he ______ his father who was ill.
A
must have looked after
B
would have to look after
C
had to look after
D
should have looked after
单选题
的展开式中
的系数是（ ）．
A
－7
B
7
C
－21
D
21
