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【单选题】

Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.

A.
had left
B.
would leave
C.
was leaving
D.
has left
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参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】Look, a group of students are playing the violin there, _______ their teacher as the conductor.

A.
in front of them stand
B.
in front of them stands
C.
in front of whom standing
D.
in front of whom stands

【单选题】— Have you graduated from collage?— Yes, ________.

A.
I studied French for two years.
B.
I have been studying French.
C.
I have studied French for two years.
D.
I had studied French for two years.