______little rain in the past sixty days, the ground is dry and people feel uncomfortable.
A. There has been
B. There is
C. There being
D. There having been
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抗癫痫药物服用至癫痫病末次发作后
A. 1~3年
B. 2~4年
C. 3~5年
D. 4~6年
E. 以上都不是
He was told that the money would have to be paid back but he refused______.
A. to do so
B. it to be done
C. doing it
D. to pay the money back
It is time we stared to think seriously about the growing shortage of raw materials in the
A. stop
B. stopped
C. to stop
D. would stop
抗癫痫药物开始治疗时,从总量的多少开始
A. 1/3~1/2
B. 1/2~2/3
C. 2/3~3/4
D. 全量
E. 以上都不是