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【单选题】
Breathing is difficult ______ .A.
when you get to the top of a high mountain
B.
when you try to climb a high mountain
C.
when you fly in a plane
D.
when you get to the foot of a high mountain
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举一反三
【单选题】What ______ she usually _____ on weekends?
A.
did, do
B.
do, do
C.
does, do
D.
did, do
【单选题】.--- What do you think of them? ---I like the first girl ______wears a blue skirt. She did ______of all.
A.
which, well
B.
who, better
C.
that, best
【单选题】What did the woman especially like to do?
A.
She liked to take a walk in the mountain.
B.
She liked to enjoy the silence.
C.
She liked to live in the cabin.
【单选题】— What ____ she ____? — She went to the doctor. [ ]
A.
is; doing
B.
did; do
C.
can; do
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