单项选择题

______ enough time and money, the scientists would have been able to discover more in this field.

A．Giving
B．To give
C．Given
D．Being given
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单项选择题
The treasury issued an order stating that ______ land purchased from the government had to be paid for in gold and silver.
A．henceforth
B．moreover
C．whereby
D．however
单项选择题
Although ______ before the war, the engine is still in perfect order.
A．building
B．to build
C．built
D．Being built
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