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His recommendation that the Air Force (investigate) ______ the UFO sighting was ap proved by the commission.

【参考答案】

(should)investigate
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A．Yes, I am Mr. Smith.B．No, he is not in the office right now.C．Speaking!D．He is not here. Can I speak for him
A．Yes, I am Mr. Smith.
B．No, he is not in the office right now.
C．Speaking!
D．He is not here. Can I speak for him
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