单项选择题

______ each other for 10 years, they decided to meet this year.

A. Not having seen
B. Having not seen
C. No seeing
D. Seeing not
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The child will get somewhere ______ left uncared for.
A. if
B. since
C. offer
D. unless
单项选择题
It was necessary that he ______ everything ready ahead of time.
A. has made
B. had made
C. make
D. makes
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