单项选择题

In 1931, Joseph Stalin invited George Washington Carver to superintend cotton plantations in southern Russia and to make a tour of the Soviet Union, but he refused.

A．supervise
B．cultivate
C．upgrade
D．discern
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单项选择题
In the 1944 election, Senator Harry. S. Truman of Missouri had distinguished himself by investigating fraud and waste among war contractors.
A．discord
B．deviation
C．deception
D．distortion
单项选择题
This platform would collapse if all of us ______ on it.
A．stand
B．stood
C．would stand
D．had stood
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