__________I see him, he looks sad.
A．Every now and thenB．Every now and again
C．Every so oftenD．Every time
D

試題分析：句意： 我每次見到他，他看起來都很難過。A. Every now and then不時(shí)地，常常；B. Every now and again偶爾，有時(shí)；C. Every so often偶爾，時(shí)常；D. Every time每次，每當(dāng)，在這里是連詞，后跟句子，引導(dǎo)的時(shí)間狀語從句。根據(jù)句意故選D。
考點(diǎn)：
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