{01}---- I wonder how much you charge for your services. ---- The first two are free ____ the third costs $30.
A.while
B.until
C.when
D.before
解析:考查连词用法。本题考查了while表示转折的用法,意为:然而;句意:—我想知道这服务你要收多少钱?—最先的两次免费,而第三次收费30。 本题选A。 {02}This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
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