With all the family members ______ on vacation without him, the boy felt extremely lonely and afraid.
A.
to have gone
B.
going
C.
had gone
D.
gone
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举一反三
【简答题】Why did Einstein have Hans give the lecture? Give two reasons. ● 3.Was the lecture a success? 4.What happened before Hans left the platform? 5.How did Hans solve the problem?