Mr. Goa ______the proposal before he looked at the guidelines.

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问题 Mr. Goa ______the proposal before he looked at the guidelines.

选项 A、writes
B、had written
C、has written
D、will write

答案B

解析 An action that is completed before another past action uses the past perfect tense. Choice (A) is the present tense. Choice (C) is the present perfect. Choice (D) is the future tense.  
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