The principal dwelled ______ traffic safety in his talka、on b、 in c、 at d、 for

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Theprincipaldwelled______trafficsafetyinhistalka、onb、inc、atd、forTheprincipaldwelled______trafficsafe

The principal dwelled ______ traffic safety in his talka、on b、 in c、 at d、 for
The principal dwelled ______ traffic safety in his talk
a、on
b、 in
c、 at
d、 for

The principal dwelled ______ traffic safety in his talka、on b、 in c、 at d、 for
a
dwell on sth.详述某事

a