My brother’s bedroom is always a mess, and he can never find anything, _________  is very frustrating. 
#75351
A
where
B
whom
C
when
D
which
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How do you guess ________?
#77434
A
did they finish the work within so short a time
B
they finished the work within so short a time
C
had they finished the work within so short a time
D
will they finish the work within so short a time