单项选择题

He ______ ten lectures on African literature, but he only gave three because of his illness.

A．must have given
B．should have given
C．gave
D．had given
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单项选择题
If one______, he will be very particular about others clothing and appearance.
A．has been overcome by vanity
B．overcomes vanity
C．is overcome by vanity
D．has overcome vanity.
单项选择题
The Industrial Revolution ______ in the invention of the steam engine.
A．originated
B．stemmed
C．derived
D．descended
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