His parents are convinced the fact the their son always focuses his mind his study.A. of

发布时间：2020-08-16 19:54:00

His parents are convinced      the fact the their son always focuses his mind      his study.
A. of; on
B. of; at
C. by; to
D. on; at

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(答案→)A. of; on
B. of; at
C. by; to
D. on; at
解析：本题考查介词。 be convinced of确信，focus one’s mind on集中某人的注意力，根据句意选A。
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