Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.
B
本题测试的是虚拟语气的用法，其中的条件从句用过去完成时 had done，主句 谓语用 would/couldmight have+done.
He‘sworkinghard_____.
Icanspeak_____German.
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
Mywalletisnowheretobefound.I_____itwhenIwasonthebus.
Iwilldotheclearingifyousee_____thelunch.
