_______you _______ any doubt on the delivery receipt, contact us at 4008 9666.

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问题 _______you _______ any doubt on the delivery receipt, contact us at 4008 9666.

选项 A、Should; have
B、In case; had
C、If; had
D、Have; had

答案A

解析 虚拟语气。本句表示对现在和将来情况的虚拟:Should you have any doubt是从If you should have any doubt转化而来的,通常这类从句后面,主句的谓语用祈使语气或陈述语气,本题的主句正是祈使句,从句显然应该由should引导,故A是正确答案。若答案为C,则主句谓语要用虚拟语气“would+动词原形”,而不用祈使语气。B项in ease“万一,以免,以防”,后面一般跟现在时或者“should+动词原形”。
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