单项选择题

The opening ceremony is a great occasion. It is essential ______ for that.

A. for us to be prepared
B. that we are prepared
C. of us to be prepared
D. our being prepared
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Land belongs to the city; there is ______ thing as private ownership of land.
A. no such a
B. not such
C. not such a
D. no such
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______ you ______ further problems with your printer, contact your dealer for advice.
A. If...had
B. Have...had
C. Should...have
D. In case...had
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