单项选择题

Now everyone is concerned about how to conquer the economic crisis ______ is very important for us to be able to preserve our standard of living.

A. which success
B. its success
C. the success of which
D. the success of it
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单项选择题
______ for a long time, the fields are all dried up.
A. There has been no rain
B. Having no rain
C. There having been no rain
D. There being no rain
单项选择题
Though ______ to see us, the professor gave us a warm welcome.
A. surprising
B. was surprised
C. surprised
D. being surprised
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