Mr. Smith works with an auto company, but he _________ for this industrial exhibition, since he is on leave. [ ]
A.
has worked
B.
worked
C.
has been working
D.
is working
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参考答案:
举一反三
【简答题】A.Things can be well kept if it is hot and damp. B.Nothing can be preserved in wet weather. C.Things can be in good condition if it is hot and dry. D.Nothing can be well preserved in a desert.