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
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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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