在发生人感染H7N9禽流感确诊病例的县(区)内，应当在病例确诊后开展为期()的强化监测
D
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句子写作：The judge had a hard time deciding___________________.
Thedoctorsare________abouttheguidelinesunderwhichtheycancarryouteuthanasia.
句子写作：Thejudgehadahardtimedeciding___________________.
句子写作：Mypresentationseemedtogowell.
Newdriversarefarmore________tohaveaccidentsthanexperienceddrivers.