下面题选哪个,为什么Is this the reason（ ）at the meeting for his carelessness in his work?A.he explained B.why he explained

this is your pen.Here ______.选下面哪个?为什么 A.it is B.is it 下面题选哪个,为什么Is this the reason（ ）at the meeting for his carelessness in his work?A.he explained B.why he explained 下面哪个句子正确?为什么?1.This hat is twenty-three dollars.2.This hat is twenty three dollars. --Who's this?--( ) is Lucy.下面四项选什么?为什么?This/It/That/She Make the door be closed 和 Make th door is closed. 哪个对? 为什么? whose bike is this?It's-------.A.me B.her C.his 选哪个,为什么? is _____ you,Mary?A it B she C that D this 选哪个,为什么? This is the one ______I wanted.关键是没有THATA which Bthe one选哪个?为什么? 请问选哪个介词!为什么?this is a good information for/to me this is the nicest picture ( ) them allA:ofB:in应该选哪个啊,为什么 This song is heard____now.A singing B to sing C sang D sung 选哪个?为什么? Is this bus (to) (for) Shanghai 填写哪个?为什么? 疑问句中is this bike还原是this bike is还是this is bike,是哪个为什么 This is mine watch. This is my watch. 哪个是对的?为什么? This is my watch.This is mine watch.哪个是对的?为什么? This coat is 80 yuan that shirt is 30yuan .____________ 110 yuan.A.it's B.this is C.that's 选哪个 为什么 that,math,this,哪个th的发音不同 -----who's that? ------_______is Lucy.下面四个选项选哪个?为什么 A.This B.It C.That D.She's