While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.

A．now and thenB．over and overC．up and downD．here and there

A

解析試題分析：詞義辨析。A時(shí)而不時(shí)；B一再；C上上下下；D到處。句意：當(dāng)打字的時(shí)候，Helen有一個(gè)習(xí)慣，她會(huì)時(shí)而不時(shí)地停下來，理順一下她那長(zhǎng)長(zhǎng)的頭發(fā)。根據(jù)句意說明A正確。
考點(diǎn)：考查詞義辨析
點(diǎn)評(píng)：詞義辨析需要在平時(shí)的教學(xué)中加強(qiáng)記憶。注意歸類總結(jié)。

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