Who is the boy ___ by the window?a、typeb、 typing c、 to be typing d、 typed

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Who is the boy ___ by the window?a、typeb、 typing c、 to be typing d、 typed
Who is the boy ___ by the window?
a、type
b、 typing
c、 to be typing
d、 typed

Who is the boy ___ by the window?a、typeb、 typing c、 to be typing d、 typed
B
这里考查非谓语,主动用ING··

B 意思是“正在窗边打字的男孩是谁?”
是正在进行时,把这句还原成陈述句的语序就是 The boy is typing by the window.