单项选择题

He found it necessary for us ______ from each other.

[A] to help and learn
B. helping and learning
C. to learn and to help
D. learning and helping
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单项选择题
When we plan our vacation, mother often offers______suggestions.
[A] careful
B. practical
C. effective
D. acceptable
单项选择题
A soldier has to learn to carry ______orders as soon as they are given.
A. on
B. out
C. through
D. off
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