We went to Mountain Tai last weekend, ________, not surprisingly, was crowded with visitors.
#4977
A
that
B
which
C
where
D
when
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Only when __________________ permission _______________ allowed to enter the lab.
#4817
A
a teacher has given; are the students
B
has a teacher given; are the students.
C
has a teacher given; the students are
D
a teacher has given; the students are