In April , thousands of holidaymakers remained ______ abroad due to the volcanic ash cloud.
#91192
A
sticking
B
stuck
C
to be stuck
D
to have stuck
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________ many times , he finally understood it.
#99000
A
Told
B
Telling
C
Having told
D
Having been told
________ from space, the earth is blue.
#95613
A
When seeing
B
When see
C
When we see it
D
When to see
It is universally        that dogs have a good sense ofsmell.
#95724
A
acknowledged
B
acknowledging
C
to be acknowledged
D
knowledge
 Taking this kind of medicine, if ________, will do harm to health.
#90760
A
continue
B
continued
C
to continue
D
continuing