问题
选择题
David didn’t give up ______ he had failed in the experiment four times．
A．if
B．while
C．though
D．since
答案
答案：C
此题考查连词，though引导让步状语从句，表示尽管。
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David didn’t give up ______ he had failed in the experiment four times．
A．if
B．while
C．though
D．since
答案：C
此题考查连词，though引导让步状语从句，表示尽管。