I never thought he should refuse.
我万没有想到他会拒绝。
It would not matter even though he should refuse.
即使他拒绝，那也没有什么关系。
It is a great pity that he should refuse our invitation.
非常遗憾他拒绝了我们的邀请。
It is better to ask him even though he (should) refuse.
即使他将拒绝，我们还是去问他比较好。
It is strange that he (should) refuse your help.
他竟然拒绝你们的帮助，真奇怪。
Should he refuse to leave, call me at the office.
万一他拒绝离开，你就给我打电话到办公室来。
Should he refuse to leave, call me at the office.
万一他拒绝离开，你就给我打电话到办公室来。
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