When he saw a little boy ______ in the river, he took off his shirt and jumped into the water.
#95958
A
struggles
B
struggling
C
to struggle
D
struggle
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________hard before, Tom is afraid of failing in the exam. 
#97409
A
Having been worked
B
Not to have worked
C
Having never worked
D
Never have worked
---You have made great progress in your English study, haven’t you? --- Yes, but much _____ .
#94377
A
remains to do
B
is remained to do
C
remains to be done
D
is remained to be done
Victor apologized for ________ to inform me of the change in the plan.
#90065
A
his being not able
B
him not to able
C
his not being able
D
him to be not able