单项选择题

Most embedded clauses require an introductory word called a subordinator, such as "that, until, before, ______, "and so on.

A．so
B．if
C．for
D．but
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单项选择题
All his novels reveal that, as time went on, Mark Twain became increasingly ______.
A．prolific
B．artistic
C．optimistic
D．pessimistic
单项选择题
The Wars of Roses was ended by ______ who destroyed the forces of the two sides of the wars, and the feudal basis of society was completely broken.
A．Henry Ⅱ
B．Henry Ⅶ
C．Henry Ⅷ
D．Henry Ⅳ
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