填空题

If such a tragedy (悲剧) (occur) ______, the damage would have been incalculable.

【参考答案】

had occurred
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Though (fail) ______ many times, Tim didn’t lose heart.
单项选择题
A．Is seven thirty OKB．At the same place.C．4 hours.D．Sure.
A．Is seven thirty OK
B．At the same place.
C．4 hours.
D．Sure.
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