A variety of butterflies ________ flying
题型:选择题
问题:
A variety of butterflies ________ flying in the jungle, one of which is a very rare one.[ ]
A. is
B. have been
C. are
D. has been
A variety of butterflies ________ flying in the jungle, one of which is a very rare one.[ ]
A. is
B. have been
C. are
D. has been