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【单选题】
．While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.
A.
occasionally
B.
simultaneously
C.
ually
D.
directly
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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shall
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keep; spreading
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prevent; spreading
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A.
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