题目内容：
根据以下资料，回答题．Onesunnyafternoon,aseven-year-oldgirlwentforawalk.Shecrossedalargeareaofgrasslandintothewoods__26__sherealizedthatshewaslost. Sittingonarockand__27__whattodo,shebegancrying.Afterawhile.She__28__towalkalongawidepathlinedwithtalltreesandthickbushes.__29__itwasgettingdark,shesawasmall,darkwoodenhouse.Sheopenedthedoorand__30__steppedin.Suddenly,sheheardastrangenoise,andsheranoutthedoorandbacktothe__31__.Coldandtired,shefellasleepneara__32__.
Thegirl’sparentswereoutandherdog,Laddy,wasathome.Laddy__33__thathismistrees（女主人）wasindanger.Hejumped__34__awindow,breakingtheglass.Helookedinthefields.Buthecouldn’tfindhismistressanywhere.However,fromthegroundcamea__35__scent(气味)asheloweredhishead.He__36__thescentandwalkedacrossthegrassland.Barking__37__intotheair,thedog__38__throughthewoodsuntilhefoundthe__39__.Butthegirlwasnotthere,soheheadedbacktothewoods.Muchtohis__40__,hesawhismistress’blueshirtinthedistance.He__41__oversomebushesandsawthelittlestream,wherethegirlwas__42__.
Whensheopenedhereyesand__43__herdogstandingbesideher,thegirlsaid,“you__44__me,Laddy,”andshekissedhimseveraltimes.Seeingtheirdaughteranddogcomingback,theparentsburstintotearsof__45__.ThatnightLaddyhadaheror’ssupper:ahugemealofsteak。请在第___26____处填上正确答案。 A．before
B．since
C．while
D．as
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