He left here for Beijing in 1998 ,____I have heard nothing from her.
A．since thenB．since whenC．from then onD．a(chǎn)fter that
B

試題分析：考查定語(yǔ)從句：句意：他在1998年離開(kāi)這兒去了北京，之后我一直沒(méi)有他的消息。從現(xiàn)在完成時(shí)判斷是AB選項(xiàng)，因?yàn)閮删湓捴g沒(méi)有連詞，所以是定語(yǔ)從句，A不能引導(dǎo)定語(yǔ)從句，since when能引導(dǎo)定語(yǔ)從句，故答案為B。
點(diǎn)評(píng)：這是特殊的定語(yǔ)從句，介詞一般接whom/which,但是帶有 then, now 的短語(yǔ)，引導(dǎo)定語(yǔ)從句時(shí)，要將 then, now 變?yōu)?when；
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