【題目】--- Is our Wechat account safe?

--- Yes, nobody can use it ________ they have the password.

A. unlessB. whenC. sinceD. if

【答案】A

【解析】

句意:——我們的微信賬戶安全嗎?——是的,沒有人可以使用它,除非他們有密碼。A. unless除非;B. when何時(shí);C. since自從;D. if如果。根據(jù)they have the password.可知,這里是unless引導(dǎo)的條件狀語從句,根據(jù)題意,故選A。

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