单项选择题

Dr. Richard will come to explain().

A.us for the problem
B.us the problem
C.the problem to us
D.for us the problem

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单项选择题
He has come back safely()of his friends.

A.to the much delight
B.to much the delight
C.to much delight
D.much to the delight
单项选择题
() a boy of ten, he started working to support his family.

A.Being
B.While
C.Because of
D.When still
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