(2013·高考山東卷)Mark needs to learn Chinese ________ his company is opening a branch in Beijing.
A．unlessB．until
C．a(chǎn)lthoughD．since
D
選D。句意：馬克需要學(xué)習(xí)漢語，因為他的公司將在北京開一個分公司。本句中的“在北京開一個分公司”是“需要學(xué)習(xí)漢語”的原因，四個選項中引導(dǎo)原因狀語從句的只有since。unless意為“如果不；除非”，引導(dǎo)條件狀語從句；until 意為“直到……時”，引導(dǎo)時間狀語從句；although意為“盡管，雖然”，引導(dǎo)讓步狀語從句。
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