模版安装必须稳固牢靠，接缝严密，不得漏浆。模版与混凝土的接触面必须清理干净并涂刷（）。
A.油漆
B.隔离
C.石灰
参考答案：B
Mr. Brown’s condition looks very serious and it is doubtful if he will ________.
A．pull back
B．pull up
C．pull through
D．pull out
