Who is the girl standing over there? Well,if you ________ kn

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Who is the girl standing over there? Well,if you ________ know,her name is Joe.
A.must
B.may
C.can
D.shall
还有,请问这里的"if"为何意?是如果还是是否或是别的意思?

答案是A,if表示如果,你如果必须知道的话,她的名字叫JOE.
再问：为什么选A?
再答：选A是因为这句话强调了非得知道，必须知道，只有必须知道，才告诉你名字，其他选项没有这个意思。B是可以知道，C是能够知道，D是应该知道。但是这和前面的if的意思不符合。

who is the girl standing over there?Well,if you ()know ,her Who is the girl standing over there?Well,if you _____ know,h 选择;---Who is the girl standing over there? You don't need to know who the girl standing over there is,b -who is the girl staning over there?-well,if you__know.her n Could you tell me who is the man standing over there? What do you think of the boy ? is standing over there? A.who 5.Who is the man standing over there?--- . who is the girl in white over there 定语从句改疑问句The girl who is standing there is my sister.改成疑问句.转 The girl who is standing there is reading a new book ,whose Who is the __man standing over there?A,thin,tall B,tall,thin