From the teacher’s patience and understanding, I have learnt what a big responsibility______is to educate us.
A．thisB．thatC．itD．one
C
本題考查it作形式主語的用法。句中have learnt后面是由what引導(dǎo)的感嘆句, it是形式主語,動詞不定式是真正的主語。
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