－You’ve dropped __________ “s” in the word “across”.－Oh, you are right, __________ letter “s” should be doubled like this “cross”.
#32593
A
a, a
B
an, a
C
an, the
D
the, a
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As volunteer teacher in the rural area，she has opened up students' eyes to the outside world.
#33948
A
the； the
B
a； a
C
a； the
D
the； a
－It was _______ great fun to be a host, wasn’t?－Yes. That’s _______ experience hard to forget.
#34483
A
／; an
B
a; an
C
; the
D
a; the