单项选择题

In vain ______ to get in touch with the Embassy.

A．they tried
B．tried they
C．did they try
D．they have tried
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单项选择题
______ conscious of my moral obligations as a citizen.
A．I was and always will be
B．have to be and always will be
C．I had been and always will be
D．I have been and always will be
单项选择题
The discovery of new oil-fields in various parts of the country filled the government with ______ hope.
A．eternal
B．infinite
C．ceaseless
D．everlasting
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