曲拐死点位置有两个,即()和后死点位置。
参考答案:前死点位置
He________ an English club last year and has improved his English a lot.
A.protected
B.produced
C.joined
D.received
It is reported that two schools, are being built in my hometown, will open next year.?[ ]
A. what
B. that
C. both of them
D. both of which