被拒绝儿童害羞与行为笨拙,他们则很少表现自己也不攻击他人。
参考答案:错
—You ought to have called him yesterday.
—Yes,I know I .
A.ought to
B.have to
C.should have
D.must have
三元催化器中的三元不包括下列哪种稀有金属?()
A.铂
B.铑
C.钯
D.钛