Look who ( ) on the blackboard?A is writing B are writing

题目

Look who ( ) on the blackboard?A is writing B are writing
希望您能解释的详细点,明白点,最好举一点例子,thank you!

答案

Look !who ( ) on the blackboard?
答案：A
当针对主语提问时,通常视为主语的单复数是未知的形式,所以,谓语动词常用第三人称单数形式.又如：They often read english novels .(针对主语提问）
------》Who often reads english novels
3 apples are in my pocket .(针对主语提问）
-------》What is in my pocket?