单项选择题

While crossing the primitive forest, they all had guns with them for protection for fear that they ______ by the wild animals.

A．would be attacked
B．must be attacked
C．were attacked
D．be attacked
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单项选择题
We shouldn't expect a technical innovation can be made perfect overnight. It has to be improved ______ in fact.
A．from cover to Cover
B．at a good pace
C．in succession
D．step by step
单项选择题
Children begin to communicate by making noises ______ they are able to speak a language.
A．before long
B．long before
C．long ago
D．long after
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