问题描述：
—Is your brother at home?—No.He _______ the library.
—Is your brother at home?
—No.He _______ the library.
A.was going to
B.has been to
C.has gone to
D.went to
为什么选 C而不选A,B,
—Is your brother at home?
—No.He _______ the library.
A.was going to
B.has been to
C.has gone to
D.went to
为什么选 C而不选A,B,
问题解答：
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