[-A68] If we have illegal immigrants _______ in, many local workers will lose their jobs.

Translation: If we allow the (continuous/continuous) influx of illegal immigrants, many local workers will lose their jobs.

Explanation: This question tests the use of have as a causative verb.

1. Have in this question is a causative verb, which means "to make/let". Like other causative verbs such as let/make, there is also a structure of "causative verb + object + object complement".

In this sentence, the object is illegal immigrants, and the complement of the object adopts the non-predicate form of the verb come.

2. A came is the past tense of the verb and must serve as a predicate in the sentence. It cannot be used as an object complement and other non-predicate structures, so it is excluded.

For example: He came here yesterday. He came here yesterday.

D having come is the perfect form of the present participle coming. Generally, this structure can only be used as an adverbial and cannot be used as an object complement, so it is excluded.

3. If the infinitive is used as the object complement of the causative verb have, the symbol to must be omitted in the active sentence, which is similar to let/make.

For example: You should have your child do homework. You should let your child do homework.

But C contains to, which is excluded.

4. The answer can only be B coming.

When the present participle coming is used as the object complement of the causative verb have, one indicates the object (illegal immigrants) and the object complement verb come Active relationship, the second indicates that the action expressed by the object complement verb continues.

For example: The boss had the workers working all day.

The boss had the workers working all day.