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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单项选择题
— Sorry, am I in your way I’ll move.— ______.
[A] Oh, well done!
B. Well, that’s my pleasure.

C. Go ahead.
D. Thank you for your kindness.
单项选择题
______you understand this rule, you’ll have no further difficulty.
[A] Once
B. Unless
C. Only
D. Until
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