He looked as if he ­­­_____ the answer.
#102238
A
knew
B
had known
C
knows
D
has known
推荐题目
Selecting a mobile phone for personal use is no easy task because technology ____ so rapidly.
#105002
A
is changing
B
has changed
C
will have changed
D
will change
I’ve _____ my things at home.
#103865
A
forget
B
forgotten
C
left
D
lost
— Look! How long _____ like this?   — Three weeks! It’s usual here that rain _____ without stopping these days of the year.
#101106
A
had it rained; pours
B
has it been raining; pours
C
is it rained; is pouring
D
does it rain; pours
—What’s that terrible noise? —The neighbors ________ for a party. 
#104750
A
have prepared
B
are preparing
C
prepare
D
will prepare