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

问题补充：

—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

答案：

A. close; who

B. tight; whom

C. tight; that

(答案→)D. close; he

解析：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。