2. 外语
  3. An architect usually makes drawings______ any construction begins.

An architect usually makes drawings______ any construction begins.

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问题 An architect usually makes drawings______ any construction begins.
选项 A、earlier
B、before
C、during
D、then
答案B
解析 Before is a subordinator that introduces an adverb clause.
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托福（TOEFL）

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