Since I could not see anything through the microscope, ______ my careful adjustment, I gave up.

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问题 Since I could not see anything through the microscope, ______ my careful adjustment, I gave up.

选项 A、for all
B、above all
C、after all
D、in all

答案A

解析 for all尽管，虽然。

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专业英语四级

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