．Our teacher is very busy.He is ________ in working out a teaching plan.
#63908
A
involve
B
involving
C
involved
D
to involve
推荐题目
The great damage which the destructive earthquake in Japan on March 11, 2011 _____ made a great many people homeless.
#70571
A
brought in
B
brought about
C
brought up
D
brought out
The computer system _______suddenly while he was searching for information on the Internet.
#67331
A
broke out
B
broke up
C
broke in
D
broke down
.I ___ the English conversation yesterday evening.
#83356
A
joined
B
join in
C
took part in
D
joined into