There are many people downstairs. What do you think _____? 
#40285
A
to happen
B
is happening
C
is happened
D
happened
推荐题目
A lot of trees________ around here every year, and we can  enjoy fresher air now.
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A
were planted
B
are planted
C
will planted
D
are planting
 —What’s your mother__________ now? —She’s __________ our house.
#37985
A
doing, clean
B
do; clean
C
does; cleans
D
doing; cleaning
 Her father often _______ to work on foot. But yesterday he ________ a bike.
#42837
A
goes, rides
B
goes, rode
C
went, rides
D
went, rode
The story of Tom Sawyer ______ in Missouri, America, in the 19th century.
#38846
A
had happened
B
was happening
C
has happened
D
happened