单项选择题

There are many kinds of metals, ______ its special properties.

A. each having
B. every having
C. each has
D. one has
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单项选择题
Not until three years ago ______ to work outside.
A. he began
B. he begins
C. began he
D. did he begin
单项选择题
The student is shy and he ______ questions in class.
A. dares not ask
B. does not dare to ask
C. dares not to ask
D. does not dare ask
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