Since I could not see anything through the microscope, ______ my careful adjustm

游客2023-11-22  16

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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