【C6】
A．if
B．until
C．when
D．though
请帮忙给出正确答案和分析，谢谢！
Cows must eat grain, ________ they will not grow fat.A、orB、butC、whenD、though
A．ifB．onceC．whenD．whereas
【C6】A．even ifB．untilC．ifD．when
【C2】A．IfB．UntilC．DespiteD．Unless
【C6】A．howB．whatC．whenD．who
【C6】A．howB．whyC．whenD．what
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