None of us knew what had happened _______ they told us about it.
A．whenB．untilC．a(chǎn)fterD．though
B

試題分析：連詞辨析。A.當(dāng)……時(shí)B.直到……C.在……之后D.盡管。句意：直到他們告訴我們這件事，我們沒有人知道發(fā)生了什么。故選B
點(diǎn)評(píng)：解答此類題型學(xué)生首先要清楚各個(gè)連詞的習(xí)慣用法，同時(shí)能夠根據(jù)上下文邏輯關(guān)系確定合適的連詞。
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