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【单选题】

When I got back home I saw a message pinned to the door _______ “Sorry to miss you; will call later.”

A.
read
B.
reads
C.
to read
D.
reading
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参考解析:
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举一反三

【单选题】I had no idea when and where _____. [ ]

A.
it happened
B.
does it happen
C.
it had happened
D.
had it happened