单项选择题

We won't encourage him to do that ______ he is in good health.

A．even if
B．in case
C．even though
D．when
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单项选择题
A dictionary of English language, ______ by Dr Samuel Johnson, was the first real attempt as a systematic and interestingly written survey of English usage.
A．constructed
B．composed
C．compiled
D．collected
单项选择题
When our university laboratory bought this microscope we were given a one year's ______.
A．reservation
B．security
C．proof
D．guarantee
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