问题
John always thinksof others instead of himself.—So he does.It is _____of him to want to help others.
A:becomeaccustomed to
B:well-knownto doctors and scientist
C:wasfirst found by Austrian researchers
D:conventional
B:well-knownto doctors and scientist
C:wasfirst found by Austrian researchers
D:conventional
正确答案是：
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