第一节 单项填空(共15小题；每小题1分，满分15分)
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
例：We last
night, but we went to the concert instead.
A must
have studied B
might study
C should
have studied D
would study
答案是C。
21.(2010·绵阳模拟 1)The Day of the Dead, an ancient
Mexican festival, is not a sad
day,
but
time to celebrate cycle
of life.
A．a；the B．不填； the C．不填；a D.
the； a