2. 外语
  3. ______ you ______ any doubt on the delivery receipt, contact us at 4008 9666.

______ 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 youshould 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 case“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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