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has had was having has had
needn’t; left mustn’t; leaving can’t; leave shouldn’t; leave
mustn't；gone to can't；gone to c
Upon For In By
has had was having has had
has had was having has had
must mustn’t can’t needn’t
B.C.D.四个选项中, 选出可以填入空白处的最佳选项。 —I saw David in the teachers’ office this morning. Do you know _________ he was there? —He went there to hand in his homework. A. how whether when why
needn’t; left mustn’t; leaving can’t; leave shouldn’t; leave
mustn''t be working can''t be working can''t work may not being working
can’t may not shouldn’t mustn’t
can’t ； went mustn’t ； left can’t ； leave may not ； going
may be must be can’t be mustn’t be
look up look into look upon look through
has had was having has had
hold in hold up hold off hold out
hold onto hold up hold off hold in
look up look upon look through look for
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