问题

In order not to be disturbed, I spent three days _____ in my study [ ]

A: locking
B: locked
C: to lock
D: lock

正确答案是：

同类题型

Mar Levine, ____ scientist at University ofPennsylvania, US, has found that competitive eaters have stomachs that canexpand like ____ balloon.

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He has ______ books and he reads ______.