I have been studying here for four years, by next summer I ________.
A、shallgraduate
B、shallbegraduated
C、shallbegraduating
D、shallhavegraduated
在新民主主义社会存在的主要经济成分有 _________。
A、三种
B、四种
C、五种
D、六种
When I came through the customs at the airport, I had to pay ________ on a clock
I had bought.
A、taxes
B、duty
C、fines
D、fees
1956年我国在生产资料所有制的社会主义改造基本完成后， 开始进入_______。
A、新民主主义时期
B、国民经济恢复时期
C、从新民主主义向社会主义过渡时期
D、社会主义初级阶段
Human behavior is mostly a product of learning ________ the behavior of animals
dependsmainly on instinct.
A、so
B、unless
C、if
D、while