单项选择题
A.studied
B.researched
C.surveyed
D.observed
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单项选择题
A.waterB.wetC.soakD.irrigate
A.water
B.wet
C.soak
D.irrigate
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单项选择题
A.escapeB.drainC.dryD.leak
A.escape
B.drain
C.dry
D.leak
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