单项选择题

______ immediately, she would be able to submit the report before the deadline.

[A] Were she acting
[B] Were she to act
[C] If she acts
[D] If she will act
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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
单项选择题
The student ______ his head when he couldn't answer the question.
[A] scrubbed
[B] scraped
[C] scratched
[D] scorched
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