单项选择题

—Have you flown very much
—As a matter of fact, this trip is ______.

A. my first
B. the first to mine
C. the first one of mine
D. my one to be the first
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单项选择题
If you want to lose weight, you should not take such food ______.
A. as is not really necessary
B. as it is not really necessary
C. as it was not really necessary
D. as was not really necessary
单项选择题
When travelling, you are advised to take travellers' checks, which provide a secure ______ to carrying your money in cash.
A. substitute
B. selection
C. preference
D. alternative
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