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

The student ______ his head when he couldn't answer the question.

[A] scrubbed
[B] scraped
[C] scratched
[D] scorched

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

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