66.6

问题描述:

66.6
please let me know____you plan to do it
a.which
b.that
c.what
d.if

D if
首先排除A,B明显语句不顺.如果用C what,plan to do 后面不能用it.所以选D.意为“如果你打算去做(这件事),请通知我.