The old man still denies ______ the book from the bookstore.
A. to steal
B. having been stolen
C. having stolen
D. steal
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John is the only one of the students who ______ to France.
A. has been
B. have been
C. had been
D. have gone
配制注射剂的溶剂是
A. 纯化水
B. 蒸馏水
C. 注射用水
D. 灭菌注射用水
E. 制药用水
It was not until 1920 () regular radio broadcast began.
A. that
B. while
C. which
D. since
假定在美国生产2吨钢的劳动时间与生产半吨羊毛的劳动时间相等,在澳大利亚,生产一吨钢的劳动时间与生产一吨羊毛的劳动时间相等。现在将澳大利亚1吨羊毛换美国的2吨钢,结果澳大利亚多得了1吨钢,美国多得了半吨羊毛。这种做法说明______。
A. 对外贸易属于直接的物物交换
B. 对外贸易可以节约社会劳动,提高经济效益
C. 对外贸易具有客观性
D. 两国经济相互依赖不利于发展本国民族经济