Forests help to keep water from running away, ____ drought (旱災(zāi)) does not often happen.

A. and
B. but
C. so
D. though
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科目：初中英語 來源：同步題 題型：單選題

Forests help to keep water from running away, ____ drought (旱災(zāi)) does not often happen.
[     ]
A. and
B. but
C. so
D. though

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