单项选择题

They are __________ to fail if they continue at the risk of all these dangers.

A．bound
B．doubtless
C．evident
D．indispensable
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单项选择题
The problem was so tough that the pupils did not know how to __________ it.
A．abolish
B．encounter
C．remove
D．tackle
单项选择题
The baby stopped crying with the __________ of its mother.
A．strip
B．stripe
C．strive
D．stroke
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