单项选择题

I wouldn't have believed it, if I ______ it happen.

A. haven't seen
B. hadn't seen
C. didn't see
D. don't see
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单项选择题
______he was, he had to make a living.
A. A child as
B. Child as
C. As a child
D. As child
单项选择题
An ______lack of food brought hunger to the Iraqi people.
A. critical
B. acute
C. crucial
D. urgent
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