题目内容
As is known to all, theory is based on practice and _____ serves practice.
| A.in hand | B.in turn | C.in return | D.in exchange |
B
考查词组辨析。In hand在手头,在控制中 in turn轮流,反过来(作用于) in return 作为回报 in exchange 交换 本句意为,众所周知,理论建立在实践的基础之上,反过来服务于实践。
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