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To qualify for a promotion, （）to exceed the quota.

A.the best thing he could do was
B.he did his best
C.all he could do was
D.his best thing was

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Your firm has been recommended to us by AMK company, （） we have done business for many years.

A.with whom
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We find （）necessary to stress the importance of making punctual shipment within the validity of the L/C.

A.how
B.that
C.it
D.us