While Helen __________ the guitar, her mother came in.
#41299
A
was playing
B
is playing
C
played
D
plays
推荐题目
I haven’t found my watch yet; in fact, I’m not sure ____ I could have done with it.
#73150
A
where
B
whether
C
what
D
how
His younger sister may already be in high school now, in ________ case this picture book is too childish for her.
#66784
A
that
B
which
C
whose
D
what
_______ in the regulations that you shouldn't tell other people the password of your e-mail account.
#72633
A
What is required
B
What requires
C
It is required
D
It requires
Children should be instructed to put things _____ they belong in their early childhood.
#68618
A
where
B
in which
C
to which
D
what