【C2】
A．since
B．if
C．as
D．while
请帮忙给出正确答案和分析，谢谢！
【C3】A．likeB．as ifC．asD．seems like
【C2】A．SinceB．ForC．AsD．In
【C12】A．SinceB．AsC．WhileD．What
【C7】A．SinceB．BeforeC．AsD．If
You’ll have more chances of promotion ______ you work hard.A、sinceB、whileC、asD、once
【C6】A．sinceB．soC．whileD．for
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