单项选择题

A.are
B.to be
C.be.
D.is
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单项选择题
A.extendingB.will extendC.extendedD.to be extended
A.extending
B.will extend
C.extended
D.to be extended
单项选择题
A.strikingB.struckC.to be strikingD.to strike
A.striking
B.struck
C.to be striking
D.to strike
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