Question

—The guard keeps         watch at the gate.
—So he does. Only those         knows well could be let in.

A．close; who

B．tight; whom

C．tight; that

D．close; he

Answer 1

D

本题考查形容词及定语从句。tight紧的，close密切的。第二空he构成省略关系词who的定语从句。完整表达为：Only those（ who he knows well） could be let in.只有那些他（门卫）非常熟悉的人才可以进去。选D。