单项选择题

It suddenly ______ to me that we could ask our neighbors for help.
A) occurred C) happened
B) considered D) thought
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单项选择题
The experiment turned ______ to be a total failure.A. in B. out C. on D. over
The experiment turned ______ to be a total failure.
A. in B. out C. on D. over
单项选择题
Without water, there ______ no life on the earth.
A. would be
B. be
C. is
D. was
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