问题
Mr Johnson, what are teachers supposed to do for the students?—As teachers, we feel ________ our duty to teach our children to be good wherever we are.[ ]
A: this
B: that
C: it
D: there is
B: that
C: it
D: there is
正确答案是：
同类题型
He enjoys collecting,. He has collected over three _____ stamps.
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