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【題目】---Can students go online during lessons?

---They can’t ________ it is for that lesson.

A. ifB. unlessC. untilD. while

【答案】B

【解析】

句意:——學生上課時能上網嗎?他們不可以,除非為了上那堂課。本題考查連詞辨析,A.如果;B.除非;C.直到;D.當……時候。答語是條件狀語從句,根據句意結構可知,需要unless連接,故選B。

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